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Keywords from Image Description:
USArmymmTrenchMortarDetailedFiringMechanismMarch. See Also mm inch Mortar Breech Mechanism December mm inch Trench Mortar Cartridge Case diagram March mm Trench Mortar mm Trench Mortar Detailed Firing Mechanism SymbolQuantityName of partMaterialLocation and purpose RLanyard cordBraided sash cord inch long Through plug