US PATENT SUBCLASS 137 / 625.21
.~.~.~ Rotary valve

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

561 R  DF  SYSTEMS {32}
625  DF  .~ Multi-way valve unit {12}
625.2  DF  .~.~ Supply and exhaust {4}
625.21.~.~.~ Rotary valve {1}
625.22  DF  .~.~.~.~> Plug type {2}

DEFINITION

Classification: 137/625.21

(under subclass 625.2) Devices in which the valve unit rotates.