US PATENT SUBCLASS 138 / 93
.~ Inflatable
Current as of:
June, 1999
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138 /
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PIPES AND TUBULAR CONDUITS
89
DF
WITH CLOSURES AND PLUGS
{7}
93
.~ Inflatable
DEFINITION
Classification: 138/93
(under subclass 89) Plugs for pipes having an inflatable member to seal against inside of the pipe opening.