US PATENT SUBCLASS 138 / 157
.~ Sectional

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

156  DF  LONGITUDINALLY SEAMED {8}
157.~ Sectional {3}
158  DF  .~.~> With separate mechanical securing means {2}
162  DF  .~.~> Tongue and slot
163  DF  .~.~> Bent over lip or flange

DEFINITION

Classification: 138/157

(under subclass 156) Device having more than one longitudinal seam so as to comprise longitudinal sections which are secured one to another.

SEE OR SEARCH THIS CLASS, SUBCLASS:

102, for sectional break-joint pipe.

117, for sectional plural duct pipe.

155, for joined sections.

SEE OR SEARCH CLASS 174, Electricity: Conductors and Insulators,

101, for removable wall electric conduits.