Patent classifications
F
MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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F41
WEAPONS
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F41A
FUNCTIONAL FEATURES OR DETAILS COMMON TO BOTH SMALLARMS AND ORDNANCE, e.g. CANNONS; MOUNTINGS FOR SMALLARMS OR ORDNANCE
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21/00
Barrels; Gun tubes; Muzzle attachments; Barrel mounting means
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F41A21/32
Muzzle attachments or glands
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F41A21/40
Chokes for shotguns; , e.g. automatic chokes
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F41A21/42
manually; adjustable
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