US PATENT SUBCLASS 138 / 166
.~ With tongue in slot

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

156  DF  LONGITUDINALLY SEAMED {8}
166.~ With tongue in slot

DEFINITION

Classification: 138/166

(under subclass 156) Device wherein there is a tongue or projection received in a slot to lock together adjacent edges of the seamed pipe.

SEE OR SEARCH THIS CLASS, SUBCLASS:

162, for tongue and slot locking means in a sectional conduit.