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Keywords: 9.2inchHowitzerMkIIBreechMechanismDiagram.jpg Breech mechanism of 9 2 inch Howitzer Mk II US service Handbook of artillery including mobile anti-aircraft and trench matériel 1920 page 290 <br>http //www archive org/details/handbookofartill00unitrich 1920-05 United States Army Ordnance Dept PD-USGov BL 9 2 inch Howitzer 2 Welin breech block BL 09 2 inch howitzer Mk II |