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Keywords: 155mmGunModel1918FillouxBreech&CounterbalanceCylinder.jpg Diagram showing Breech mechanism and Counterbalance cylinder of French Canon de 155mm GPF Model of 1918 US Army service Diagram in Handbook of artillery including mobile anti-aircraft and trench matériel 1920 page 236 <br>http //www archive org/details/handbookofartill00unitrich 1920-05 United States Army Ordnance Dept US Government no copyright PD-USGov Canon de 155 mm GPF diagrams 1910s technical drawings |