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F41A—FUNCTIONAL FEATURES OR DETAILS COMMON TO BOTH SMALLARMS AND ORDNANCE, e.g. CANNONS; MOUNTINGS FOR SMALLARMS OR ORDNANCE
F41A21/00—Barrels; Gun tubes; Muzzle attachments; Barrel mounting means
F41A21/10—Insert barrels, i.e. barrels for firing reduced calibre ammunition and being mounted within the normal barrels
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Mutual Connection Of Rods And Tubes
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FR942159D1945-10-231947-01-17
Reducing caliber tube along the entire length of the rifle barrel, with matching cartridge, can fit any shotgun
ExpiredFR942159A
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