US PATENT SUBCLASS 138 / 99
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Current as of: June, 1999
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138 /   HD   PIPES AND TUBULAR CONDUITS

97  DF  REPAIRING {1}
98  DF  .~ Patches {1}
99.~.~ External

DEFINITION

Classification: 138/99

(under subclass 98) Patches which are applied externally of the pipe and usually have a clamp band encircling the pipe.