US PATENT SUBCLASS 138 / 91
.~ Double end

Current as of: June, 1999
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138 /   HD   PIPES AND TUBULAR CONDUITS

89  DF  WITH CLOSURES AND PLUGS {7}
91.~ Double end

DEFINITION

Classification: 138/91

(under subclass 89) Plugs for pipes wherein both ends of the pipe are plugged by connected plugs.