US PATENT SUBCLASS 137 / 247.43
.~.~.~ Topside access beneath cover plate closed floor 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}
247.43.~.~.~ Topside access beneath cover plate closed floor opening

DEFINITION

Classification: 137/247.43

(under subclass 247.41) Apparatus installed beneath a surface and having a top side access means located beneath an opening in the surface, the opening being provided with a removable cover plate.