US PATENT SUBCLASS 137 / 625.12
.~.~ Sequentially progressive opening or closing of plural ports

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}
625.12.~.~ Sequentially progressive opening or closing of plural ports {1}
625.13  DF  .~.~.~> With subsequent closing of first port {2}

DEFINITION

Classification: 137/625.12

(under subclass 625) Devices in which a plurality of ports are sequentially progressively opened or closed by a valve unit.