US PATENT SUBCLASS 89 / 21
.~.~.~ Fixed ammunition

Current as of: June, 1999
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89 /   HD   ORDNANCE

17  DF  BREECH CLOSURES {4}
19  DF  .~ Screw {1}
20.2  DF  .~.~ Interrupted {2}
21.~.~.~ Fixed ammunition

DEFINITION

Classification: 89/21

Closures of the divided-screw-thread type adapted to fire charges enclosed in a rigid case.