US PATENT SUBCLASS 137 / 489.3
.~.~.~.~ Loose fitting piston

Current as of: June, 1999
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137 /   HD   FLUID HANDLING

455  DF  LINE CONDITION CHANGE RESPONSIVE VALVES {11}
485  DF  .~ Pilot or servo controlled {3}
488  DF  .~.~ Fluid pressure type {2}
489  DF  .~.~.~ Choked or throttled pressure type {4}
489.3.~.~.~.~ Loose fitting piston

DEFINITION

Classification: 137/489.3

(under subclass 489) Devices in which the unvalved passage is between the piston and the cylinder walls.