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Keywords from Image Description:
.inchTrenchMortarBreechDiagram. See Also mm inch Trench Mortar Detailed Firing Mechanism diagram March mm inch Trench Mortar Cartridge Case diagram March mm Trench Mortar Crosssection of rightside Elevation and Plan views of inch mm Trench Mortar Breech and Firing mechanism as adopted by the US Army December Nomenclature