US PATENT SUBCLASS 89 / 191.02
.~.~ Annular piston

Current as of: June, 1999
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89 /   HD   ORDNANCE

125  DF  AUTOMATIC {14}
191.01  DF  .~ Gas piston type {3}
191.02.~.~ Annular piston

DEFINITION

Classification: 89/191.02

Annular piston:

(under subclass 191.01) Devices wherein the gas-operated device is circular in shape.