M29a1 81mm medium mortar Patent us3782240 Mm mortar
Mm Mortar - Improvised Weaponry - Bev Fitchett's Guns Magazine
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Mm Mortar - Improvised Weaponry - Bev Fitchett's Guns Magazine
M29A1 81mm Medium Mortar
81mm Mortar Ammunition And Fuzes
Patent US3782240 - Firing mechanism for mortars - Google Patents