| GENE SLOVERS US NAVY PAGES ORDNANCE PAMPHLET 127 UNITED STATES NAVAL GUNS THEIR MARKS AND MODIFICATIONS SERVICE GUNS 31 AUGUST 1956 |
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| SECTION 1: CALIBER .50 GUNS (AIRCRAFT) |
| SECTION 2: 20MM GUN BARRELS |
| SECTION 3: 20MM GUN MECHANISMS (AIRCRAFT) |
| SECTION 4: 40MM GUNS |
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