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Keywords: Laying6inchNewtonMortar.jpg Diagram showing methods of installing 6 inch Newton Trench Mortar and Bed Figures 16 - 21 in Handbook of artillery including mobile anti-aircraft and trench matériel 1920 page 374 <br>http //www archive org/details/handbookofartill00unitrich 1920-05 United States Army Ordnance Dept US Government - Public Domain PD-USGov Newton 6 inch Mortar 1920s diagrams 1920s technical drawings |