US PATENT SUBCLASS 89 / 31
TOMPIONS AND VALVES
Current as of: June, 1999
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DEFINITION
Classification: 89/31
Devices for closing the gun-muzzle or other opening in the barrel.
SEE OR SEARCH CLASS
138, Pipes and Tubular Conduits
89, and indented subclasses and the notes thereto, for closures or plugs for pipes and tubular conduits.
181, Acoustics,
223, for gun silencers, per se.