US PATENT SUBCLASS 16 / 52
.~.~ Concentric spring chamber

Current as of: June, 1999
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16 /   HD   MISCELLANEOUS HARDWARE

49  DF  CHECKS AND CLOSERS {6}
51  DF  .~ Liquid {8}
52.~.~ Concentric spring chamber {1}
53  DF  .~.~.~> Cam

DEFINITION

Classification: 16/52

(under subclass 51) Devices in which the spring-chamber is within or concentric with the liquid-chamber.