US PATENT SUBCLASS 188 / 282.7
.~.~.~ Ball-type valve

Current as of: June, 1999
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188 /   HD   BRAKES

266  DF  INTERNAL-RESISTANCE MOTION RETARDER {29}
281  DF  .~ Resistance alters relative to direction of thrust member (e.g., high resistance in one direction, low in the other) {1}
282.1  DF  .~.~ Via valved orifice in thrust member {4}
282.7.~.~.~ Ball-type valve

DEFINITION

Classification: 188/282.7

Ball-type valve:

(under subclass 282.1) Valved piston in which the size varying element is a sphere, usually solid.