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Keywords: 3inch19041905GunBreechMechanismDiagram.jpg Section through breech mechanism of US 3 inch Field Gun Model of 1904 - 1905 Diagram in Handbook of artillery including mobile anti-aircraft and trench matériel 1920 page 123 <br>http //www archive org/details/handbookofartill00unitrich 1920-05 United States Army Ordnance Dept US Government no copyright PD-USGov 3 inch Gun Model 1902-1904-1905 Artillery drawings 1920s technical drawings Gun breeches Bill of materials |