US PATENT SUBCLASS 137 / 247.51
.~.~.~.~ Access opening

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

247  DF  WITH LIQUID VALVES OR LIQUID TRAP SEALS {3}
247.11  DF  .~ Liquid seal in liquid flow line; flow liquid forms seal {8}
247.41  DF  .~.~ U-seals {3}
247.49  DF  .~.~.~ Even diameter legs {1}
247.51.~.~.~.~ Access opening

DEFINITION

Classification: 137/247.51

(under subclass 247.49) Seals having access means.

SEE OR SEARCH CLASS

138, Pipes and Tubular Conduits,

92, for lateral plugs and closures.