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Folks,

20 MM Antiaircraft Gun Mount, OP 909, 1943, is a Navy service manual for the anti-aircraft gun of choice during the early years of WW II.

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ORDNANCE PAMPHLET NO. 909
MOUNTS
ASSEMBLIES
20 MM. MOUNTS MARK 2, MARK 2 MOD. 1, MARK 2
MOD. 2; MARK 4, MARK 4 MOD. 1 MARK 4 MOD. 2,
MARK 4 MOD. 3; MARK 5, MARK 5 MOD. 1, MARK 5
MOD. 3, MARK 5 MOD. 4; MARK 6; MARK 10 AND
MARK 10 MOD. 1
DESCRIPTION
MARCH 1943
Change 1 Entered

 

NOTICE

Please make the following corrections on the pages listed and Plate 1:

PAGE NO. CORRECTION
21 Eighth line up from bottom of page-delete sentence-See Section C-C, Plate 1.
22 Sixteenth line from top of page-delete sentence-See Plan View, Plate 1.
28 Second line from top of page-change (12-Z-313-5) to read (OE-2283).
28 Fifth line from top of page-change (OE-2157) to read (OE-2257).
29 Operation No. 8, fourth line-change (OW-2137) to read (OE-2137).
31 Operation No. 18, first and third lines-change (12-Z-313-5) to read (OE-2283).
36 Operation No. 32, sixth line-change (OE-2086) to read (OE-2045).
44 Operation No. 24, second line-change oiler (OE-2138) to read plug (299759-5).
45 Operation No. 29, first line-after word screws add (367557-8).
45 Operation No. 33, first line-change (OE-2158) to read (299948-1).
51 Operation No. 1, between lines (c) and (e)-add (d) Place spacing ring (OE-2067) on spring (OE-2062).
Plate 1
at p. 56
Left end of plate, Section A-A-change top (OE-2168) (leading to the spiral spring housing bushing, printed in blue) to read (OE-2166).

Center of plate, list of part numbers starting with 299948-1-change (OE-2093) to read (OE-2036); change (OE-2030) to read (OE-2093).

Right center of plate, below handwheel, list of parts starting with (OE-2108)-change (OE-2142) to read (OE-2123) and (OE-2123) to read (OE-2142).

 

RESTRICTED
NAVY DEPARTMENT, BUREAU OF ORDNANCE, WASHINGTON, D.C.
To all holders of Ordnance Pamphlet 909
Insert change; write on cover "Change I entered.'
Approved by The Chief of The Bureau of Ordnance
signature

signature

OP 909 CHANGE 1
7 July 1944
Page -- Page 1


ORDNANCE PAMPHLET 909
is changed as follows:
MOUNTS-ASSEMBLIES -20 MM.
Mounts Mk 2, Mk 2 Mod 1, Mk 2 Mod 21
Mk 4, Mk 4 Mod 1, Mk 4 Mod 2, Mk 4 Mod 3;
Mk 5, Mk 5 Mod I, Mk 5 Mod 3, Mk 5 Mod 4;
Mk 6; Mk 10 and Mk 10 Mod 1 - Description

1. Wherever extra light mineral oil NS 1042, 2075, or 2110, or medium mineral oil NS 1065, or 3065 is now specified light preservative oil 0rdnance Specification 1362 should be used.

2. Wherever oil mixture OE 3533 is- now specified, transformer oil NDS 14-0-12 or a mixture of 85% extra light oil NS 1042, 2110, or 2075, and 15% Diesel fuel oil NDS -7-0-2 should be used.

3. Where anti-seize compound NS 52-0-19 (INT) is specified, bearing grease Ordnance Specification 1350 should be used.

 

ORDNANCE PAMPHLET NO. 909


MOUNTS

ASSEMBLIES

20 MM MOUNTS MARK 2, MARK 2 MOD. 1, MARK 2
MOD. 2; MARK 4, MARK 4 MOD. 1 MARK 4 MOD. 2,
MARK 4 MOD. 3; MARK 5, MARK 5 MOD. 1, MARK 5
MOD. 3, MARK 5 MOD. 4; MARK 6; MARK 10 AND
MARK 10 MOD. 1


DESCRIPTION


Department of the Navy
Bureau of Ordnance

MARCH 1943

 

2
 
This page is blank.
 

3
 

PREFACE

20 mm. A.A. Gun Mounts Mark 2, Mark 2 Mod. 1, Mark 2 Mod. 2; Mark 4, Mark 4 Mod. 1, Mark 4 Mod. 2, Mark 4 Mod. 3; Mark 5, Mark 5 Mod. 1, Mark 5 Mod. 3, Mark 5 Mod. 4; Mark 6; Mark 10 and Mark 10 Mod. 1.

This Ordnance Pamphlet, No. 909, describes the construction, operation, and maintenance of the various 20 mm. A.A. Gun Mounts now in service.

Additional Ordnance publications relating to the use of the 20 mm. A.A. Guns and Mounts are:

O.P. 911- 20 mm. Machine Gun Mechanisms Marks 2 and 4;
20 mm. Guns Marks 2, 3, 4, and 4 Mod. 1;
20 mm. Sights Marks 2, 4, 4 Mod. 1, and 5;
20 mm. Hand Grips and Shoulder Rests Marks 2, 4, and 5.
O.D. 4429- Gun Sight Mark 14 Mod. 2-Installation and Operation.
Sk. No. 103308- 20 mm. Machine Gun and Mount Index.

The Mark 2 Mount is built to British standards and specifications in this country, but it has been issued by the U. S. Navy as well as the British Admiralty. In this mount the trunnion height is varied by means of a handwheel operating, through a train of gears, a screw inside the stand.

The Mark 4 Mount is identical in operation and almost identical in appearance to the Mark 2 Mount. The Mark 4 Mount has the cocking cable wound around the stand and secured to a hook at one end and a snap at the other. The Mark 2 Mount Cocking Cable is secured to a spring loaded reel which is housed within the stand. The Mark 4 Mount is built to U. S. standards and specifications and is issued by both the U. S. Navy and British Admiralty.

Mark 5 Mount is a Fixed Trunnion Height type. The use of Mounts Mark 5 is a temporary expedient and these mounts will be replaced on Naval Vessels by Mounts Marks 2, 4, 6, or 10, when available. A limited number of Mark 5 Mounts have been issued for installation in Merchant Vessels and these mounts are considered to be practical for this purpose.

Mark 5 Mod. 4 Mount is for use on submarines. It is of the Fixed Trunnion Height type with a shorter pedestal than used on the Mark 5 Mount. Also it has a number of holes drilled in the pedestal to permit sea water to drain out when the submarine is surfaced.

The Mark 6 Mount is an Adjustable Trunnion Height hydraulically operated type. The height of the trunnion is varied by a hydraulic system operated by foot pedals located in the pedestal.

Mark 10 Mount is a Fixed Trunnion Height type. The stand is a weldment of steel stampings, instead of a casting such as used on other types of 20 mm. A.A. Gun Mounts.

 

4
 
This page is blank.
 

5
 

TABLE OF CONTENTS


NOTE- Plate 1 is the folded insert of Marks 2 and 4 Gun Mount at page 56.
Plate 2 is the folded insert of Mark 5 Mod. 3 Gun Mount at page 72.
Plate 3 is the folded insert of Mark 6 Gun Mount at page 120.

Text
Page
Illus.
Fig. No.
Preface 3
Chapter 1
GENERAL CHARACTERISTICS
Mark 2 Mod. 2, Mark 4 Mod. 2, and Mark 4 Mod. 3 Mounts 11
Mark 5 Mod. 3 Mount 11
Mark 5 Mod. 4 Mount 12
Mark 6 Mount 13
Mark 10 and Mark 10 Mod. 1 Mounts 14
Index of 20 mm. A.A. Gun Mount Marks and Modifications 15
Chapter 2
MARK 2 MOD. 2, MARK 4 MOD. 2, and MARK 4 MOD. 3 MOUNTS
Description-Mark 2 Mod. 2 and Mark 4 Mod. 2 19 1
Description-Mark 4 Mod. 3 24
Construction 21 2-3 Plate 1
Operation 22
Lubrication 27 4
Stripping-Mark 4 Mod. 2 and Mark 4 Mod. 3 29 6 to 12 incl.
  Tools 30 5
Reassembly-Mark 4 Mod. 2 and Mark 4 Mod. 3 38 13 to 17 incl.
Equalizing Spring Stripping 47 18-19
Equalizing Spring Reassembly 51 18-19
Stripping-Mark 2 Mod. 2 53
Reassembly-Mark 2 Mod. 2 54
Chapter 3
MARK 5 MOD. 3 MOUNT
Description 59
  General 59 20 Plate 2
  Detailed 59 20 and 21
  Pedestal and Pivot 59
  Carriage 59
  Cradle 61
  Gunner's Platform 61
  Carriage Lock 61
  Trunnion Bracket and Pivot Locking Bolt 61
  Gun Securing Bolt 61
  Cartridge Bag 61
 

6
 
Chapter 3 (Cont'd)
MARK 5 MOD. 3 MOUNT
Test
Page
Illus.
Fig. No.
Lubrication 63 22
Operation 64
Pivot Thrust Bearing Adjustment 65 21
Stripping 66 Plate 2
  Magazine 66
  Sight 66
  Shoulder Rest 66
  Gun 66
  Cartridge Bag Assembly 66
  Weight and Band Assembly 66
  Shield Assemblies 66
  Cradle Assembly 67
  Carriage Assembly 67
  Pivot Retainer 68
  Pivot 68
Reassembly 69 21 Plate 2
  Pivot 69
  Pivot Retainer 69
  Carriage Assembly 69
  Pivot Oil Level 70
  Cradle Assembly 70 23
  Weight and Band Assembly 71
  Cartridge Bag Assembly 71
  Shield Assemblies 71
Chapter 4
MARK 5 MOD. 4 MOUNT
Description 75
  General 75
Service Data 75
Cleaning 75
Lubrication 75 24
Chapter 5
MARK 6 MOUNT
Description 79
  General 79 25 Plate 3
  Detailed 79 26
  Base 79
  Ram Cylinder 79
  Pedestal Casing 81
  Ram 81
  Carriage 81
  Cradle 81
 

7
 
Chapter 5 (Cont'd)
MARK 6 MOUNT
Test
Page
Illus.
Fig. No.
Hydraulic Operating and Control Mechanism 81 27
  Oil Tank 81
  Oil Pumps and Pump Pedals 83
  Pump Valves and Valve Sleeves 83
  Carriage Lock 83
  Cradle Lock 83
  Gun Securing Bolt 84
  Cartridge Bag Assembly 84
Lubrication 86 28
  Cradle Lock Plunger 86
  Carriage Lock Plunger 86
  Hydraulic System-Oil Tank 86
  Piston Rod Bearings 86
  Pedal Lever Pivot Bearings 86
  Ram Bearing 86
  Gun Securing Bolt 86
  Cradle Cocking Sheave 86
  Cradle Trunnion Pins 86
Operation of Mount 87
  To Raise the Carriage 87
  To Lower the Carriage 87
  Splinter Bulwarks 88 29
Description of Hydraulic Operation 89 30 to 33 incl.
Stripping 93 Plate 3
  Magazine 93
  Sight 93
  Cartridge Bag Assembly 93
  Weight and Band Assembly 93
  Draining Oil 93
  Ram Spring Retainer Plug-Removal 94 34
  Ram Spring Retainer Plug-Safety Position 94 47
  Ram Spring Retainer 95
  Shoulder Rest 95
  Gun 95
  Shield Assemblies 95
  Cradle Assembly 95
  Ram Cylinder Sleeve 96
  Carriage Assembly 96
  Ram Cylinder Sleeve 96
  Ram Spring and Tube Assembly-Removal 96 35
  Pedal Opening Cover 96
  Pedestal Casing 97
  Pump Piston Rod Link 97
  Pump Lever Bracket Assembly 97
  Pump Assembly 97 36
  Base Air Vent 97
  Oil Tank Assembly 97
  Ram and Ram Cylinder 98
 

8
 
Chapter 5 (Cont'd)
MARK 6 MOUNT
Text
Page
Illus.
Fig. No.
  Ram 98 43
  Ram Cylinder 99
  Base Assembly 99 37 and 38
  Intake Valves 100 40
  Outlet Valves 100 40
  Ram Spring and Tube Assembly-Stripping 100 18 and 39
Reassembly 104 40 Plate 3
  Base Assembly 104
  Pump Valves-Outlet 104 41 and 42
  Pump Valves-Intake 104
  Ram Cylinder 105
  Ram 105 43
  Ram Cylinder 107 44
  Base Air Vent 109
  Oil Tank Assembly 109 45
  Oil Pumps-Reassembling 109 46
  Oil Pump Assemblies-Installation 110
  Pump Pedals 110
  Pedestal Casing 110
  Cylinder Sleeve 111
  Ram Spring and Tube Assembly-Reassembling 111 18, 39, and 47
  Ram Spring and Tube Assembly-Installation 112 48
  Carriage Assembly-Reassembling 113
  Carriage Assembly-Installation 113
  Cradle Assembly-Reassembling 113
  Cradle Assembly-Installation 114 49
  Shield Assemblies 115
  Ram Spring Retainer 115
  Cylinder Sleeve 115
  Ram Spring Retainer Plug 115 50
  Ram Air Vent Valve Assembly 115
  Filling Hydraulic System 116
  Bleeding 116 51
  Ram Cover 117
  Weight and Band Assembly 117
  Cartridge Bag Assembly 117
  Casing Hole Cover 118
  Cylinder Sleeve Set Screw 118
Lubrication 118
Tools 120 52
Chapter 6
MARK 10 and MARK 10 MOD. 1 MOUNTS
Description 125 53
  General 125
  Pedestal and Pivot-Mark 7 and Mark 7 Mod. 1 125
  Carriage-Mark 7 125
  Shield-Mark 4 Mod. 1 126
 

9
 
Chapter 6 (Cont'd)
MARK 10 MOUNT
Text
Page
Illus.
Fig. No
Ring Step 126
Pivot Thrust Bearing Adjustment 128
Stripping and Reassembly 128
Lubrication 128 54 and 55
Instructions for Ordering Replacement Parts 133
Parts List
MARK 2 MOD. 2 MOUNT
Cradle-Mark 2 Mod. 2 135
Carriage-Mark 2 140
Stand-Mark 2 145
Shield-Mark 2 160
MARK 4 MOD. 2 MOUNT
Cradle-Mark 4 Mod. 2 135
Carriage-Mark 4 140
Stand-Mark 4 145
Shield-Mark 4 160
Tools 198
MARK 4 MOD. 3 MOUNT
Cradle-Mark 5 163
Carriage-Mark 4 Mod. 1 163
Stand-Mark 4 166
MARK 5 MOD. 3 MOUNT
Cradle-Mark 4 Mod. 2 169
Carriage-Mark 5 172
Stand-Mark 5 175
Shield-Mark 4 176
MARK 6 MOUNT
Cradle-Mark 5 179
Carriage-Mark 6 182
Stand-Mark 6 184
Shield-Mark 4 Mod. 1 192
MARK 10 MOUNT
Carriage-Mark 7 195
Stand-Mark 7 197
Cross Index to OE and Bureau of Ordnance Numbers 201
 

10
 

Notes

 

11
 

GENERAL CHARACTERISTICS


Chapter 1
Mark 2 Mod. 2, Mark 4 Mod. 2, and Mark 4 Mod. 3 Mounts

Type Adjustable trunnion height, handwheel operated through mechanical gearing to jack screw lift.
Working Circle-Diameter 10 Feet
Distance from mount centerline to face of shoulder pad (with Mark 4 shoulder rest)-Gun horizontal 35 1/2 Inches
Elevation Limits-Above horizontal 87 Degrees
    -Below horizontal. 5 Degrees
Training Limits Unlimited*
Height of Trunnion-Column extended 62 1/4 Inches
Height of Trunnion-Column retracted 46 1/2 Inches
Holding Down Bolts
  Number of Holes-Equally spaced 5
  Diameter of Holes 1 5/32Inches
  Diameter of Bolts 1 1/8 Inches
  Diameter of Bolt Circle 26 3/8 Inches
Stand Bearing Diameter-Outside. 29 1/2 Inches
    -Inside. 24 Inches
Weights
  Stand-Mark 4 1103 Pounds
  Stand-Mark 4 Mod. 1 Pounds
  Carriage-Mark 4 88 Pounds
  Carriage-Mark 4 Mod. 1 Pounds
  Cradle-Mark 4 Mod. 2 83 Pounds
  Cradle-Mark 5 84 Pounds
  Mount-Mark 4 Mod. 2 1274 Pounds
  Mount-Mark 4 Mod. 3 Pounds
  Shield-Mark 4 238 Pounds
  Shield-Mark 4 Mod 1 241 Pounds
  Shoulder Rest-Mark 4 20 Pounds
  Sight-Mark 4 Mod. 1 13 Pounds
  Gun Mechanism (without magazine)-Mark 4
    Ribbed Barrel 141 Pounds
    Solid Barrel 150 Pounds
  Total weight, gun mechanism (solid barrel) and mount assembly Mark 4 Mod. 2 of above components 1695 Pounds
For other characteristics see Working Circle Drawing, No. 299907.
Mark 5 Mod. 3 Mount
Type Fixed Trunnion Height
Working Circle-Diameter 10 Feet
Distance from mount centerline to face of shoulder pad (with Mark 4 shoulder rest)-Gun horizontal. 35 1/2 Inches
Elevation Limits-Above horizontal. 87 Degrees
    -Below horizontal 5 Degrees
Training Limits Unlimited*
Trunnion Height 62 1/4 Inches

*Train limited by the length of power cable when mounts are equipped with Mark

 

12
 
MARK 5 MOD. 3 MOUNT (Cont'd)
Oil Capacity 1.65 or 1.95 Pounds. (See Operation No. 1 page 69).
Holding Down Bolts
Number of Holes-Equally spaced 5
Diameter of Holes 1 5/32 Inches
Diameter of Bolts 1 1/8 Inches
Diameter of Bolt Circle. 26 3/8 Inches
Stand Bearing Diameter-Outside 29 1/2 Inches
    -Inside 23 1/2 Inches
Weights
  Stand-Mark 5 963 Pounds
  Carriage-Mark 5 63 Pounds
  Cradle-Mark 4 Mod. 2 83 Pounds
  Mount-Mark 5 Mod. 3 1109 Pounds
  Shield-Mark 4 238 Pounds
  Shoulder Rest-Mark 5 28 Pounds
  Sight-Mark 4 Mod. 1 13 Pounds
  Gun Mechanism (without magazine)-Mark 4
    Ribbed Barrel 141 Pounds
    Solid Barrel 150 Pounds
Total weight, gun mechanism (solid barrel) and mount assembly of above components 1538 Pounds
For other characteristics see Working Circle Drawing, No. 299908.
Mark 5 Mod. 4 Mount
Type Fixed Trunnion Height
Working Circle-Diameter 10 Feet
Distance from mount centerline to face of shoulder pad (with Mark 5 shoulder rest)-Gun horizontal 38 1/2 Inches
Elevation Limits-Above horizontal 87 Degrees
    -Below horizontal 5 Degrees
Training Limits Unlimited*
Trunnion Height 50 3/4 Inches
Holding Down Bolts
  Number of Holes-Equally spaced. 5
  Diameter of Holes 1 5/32 Inches
  Diameter of Bolts 1 1/8 Inches
  Diameter of Bolt Circle 26 3/8 Inches
  Stand Bearing Diameter-Outside. 29 1/2 Inches
    -Inside 23 1/2 Inches
Weights
  Stand-Mark 5 Mod. 2 (no lap at weld) 827 Pounds

*Train limited by the length of power cable when mounts are equipped with Mark 14 Mod. 2 gun sight.

 

13
 
MARK 5 MOD. 4 MOUNT (Cont'd)
  Carriage-Mark 5 63 Pounds
  Cradle-Mark 4 Mod. 2 83 Pounds
  Mount-Mark 5 Mod. 4 (no lap at weld) 973 Pounds
  Shield-Mark 4 238 Pounds
  Shoulder Rest-Mark 5 20 Pounds
  Sight-Mark 4 Mod. 1 13 Pounds
  Gun Mechanism (without magazine)-Mark 4
    Ribbed Barrel 141 Pounds
    Solid Barrel 150 Pounds
Total weight, gun mechanism (solid barrel) and mount assembly (no laps at weld) of above components 1394 Pounds
For other characteristics see Working Circle drawing, No. 299908.
Mark 6 Mount
Type Adjustable trunnion height, foot pedal operated hydraulic lift.
Working Circle 10 Feet
Distance from mount centerline to face of shoulder pad (with Mark 5 shoulder rest)-Gun horizontal 40 1/2 Inches
Elevation Limits-Above horizontal. 90 Degrees
    -Below horizontal 15 Degrees
Training Limits Unlimited*
Height of Trunnion
  Column Extended 68 3/8 Inches
  Column retracted 44 3/4 Inches
Holding Down Bolts
  Number of Holes-Equally spaced. 5
  Diameter of Holes 1 5/32 Inches
  Diameter of Bolts 1 1/8 Inches
  Diameter of Bolt Circle 26 3/8 Inches
Stand Bearing Diameter-Outside 30 1/4 Inches
    -Inside. 19 1/2 Inches
    -Clearance Circle over heel lugs 38 Inches
Weights
  Stand-Mark 6 (with oil) 1110 Pounds
  Carriage-Mark 6 79 Pounds
  Cradle-Mark 5 84 Pounds
  Mount-Mark 6 (with oil) 1273 Pounds
  Shield-Mark 4 Mod. 1 241 Pounds
  Shoulder Rest-Mark 5 20 Pounds
  Sight-Mark 5 7 Pounds
  Gun Mechanism (without magazine)-Mark 4
    Ribbed Barrel 141 Pounds
    Solid Barrel 150 Pounds

*Train limited by the length of power cables when mounts are equipped with Mark 14 Mod. 2 gun sight.

 

14
 
MARK 6 MOUNT (Cont'd)
Total weight, gun mechanism (solid barrel) and mount assembly of above components 1691 Pounds
For other characteristics see Working Circle Drawing, No. 300047.
Mark 10 and Mark 10 Mod. 1 Mounts
Type Fixed Trunnion Height
Working Circle-Diameter 10 Feet
Distance from mount centerline to face of shoulder pad (with Mark 5 shoulder rest)-Gun horizontal 41 7/8 Inches
Elevation Limits-Above horizontal 90 Degrees
    -Below horizontal 15 Degrees
Training Limits Unlimited*
Trunnion Height 52 1/2 Inches
Holding Down Bolts
  Number of Holes-Equally spaced 5
  Diameter of Holes 1 5/32 Inches
  Diameter of Bolts 1 1/8 Inches
  Diameter of Bolt Circle 26 3/8 Inches
Stand Bearing Diameter-Outside 29 1/2 Inches
    -Inside 23 1/4 Inches
Weights
  Stand-Mark 7 Pounds
  Stand-Mark 7 Mod. 1 Pounds
  Carriage-Mark 7 Pounds
  Cradle-Mark 5 84 Pounds
  Mount-Mark 10 Pounds
  Mount-Mark 10 Mod. 1 Pounds
  Shield-Mark 4 Mod. 1 241 Pounds
  Shoulder Rest-Mark 5 28 Pounds
  Sight-Mark 5 7 Pounds
  Gun Mechanism (without magazine)
    Ribbed Barrel 141 Pounds
    Solid Barrel 150 Pounds
Total weight, gun mechanism (solid barrel) and mount assembly of above components Pounds

For other characteristics see Working Circle Drawing, No. 329826.

*Train limited by the length of power cables when mounts are equipped with Mark 14 Mod. 2 gun sight.

 

15
 
MARKS AND MODIFICATIONS
MOUNT
MARK
STAND
MARK
CARRIAGE
MARK
CRADLE
MARK
SHIELD
MARK
TYPE
MARK
2 2 2 2 2 MECHANICAL
2 MOD. 1 2 2 2 MOD. 1 2 MECHANICAL
2 MOD. 2 2 2 2 MOD. 2 2 MECHANICAL
4 4 4 4 4 MECHANICAL
4 MOD. 1 4 4 4 MOD. 1 4 MECHANICAL
4 MOD. 2 4 4 4 MOD. 2 4 MECHANICAL
4 MOD. 3 4 MOD. 1 4 MOD. 1 5 4 MOD. 1 MECHANICAL
5 5 5 4 4 FIXED
5 MOD. 1 5 5 4 MOD. 1 4 FIXED
5 MOD. 3 5 5 4 MOD. 2 4 FIXED
5 MOD. 4 5 MOD. 2 5 4 MOD. 2 4 FIXED (Sub.)
6 6 6 5 4 MOD. 1 HYDRAULIC
10 7 7 5 4 MOD. 1 FIXED (Tripod)
10 MOD. 1 7 MOD. 1 7 5 4 MOD. 1 FIXED (Tripod)
 

16
 

Notes

 

17
 

Notes

 

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