US PATENT SUBCLASS 89 / 4.1
.~ Rotary breech block

Current as of: June, 1999
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89 /   HD   ORDNANCE

4.05  DF  EXPLOSION OPENED BREECH {3}
4.1.~ Rotary breech block

DEFINITION

Classification: 89/4.1

Rotary breech block:

(under subclass 4.05) Subject matter where the force of the explosion opens a closure which rotates about the axis of the gun barrel to close or open the breech.