US PATENT SUBCLASS 138 / 90
.~ Test plugs

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

89  DF  WITH CLOSURES AND PLUGS {7}
90.~ Test plugs

DEFINITION

Classification: 138/90

(under subclass 89) Plugs for pipes having provisions whereby a fluid may be introduced into the pipe through the plug or for the attachment of a gauge for the purpose of testing the pipe for leaks.