US PATENT SUBCLASS 212 / 204
.~ By mounting on vertically extensible support

Current as of: June, 1999
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212 /   HD   TRAVERSING HOISTS

199  DF  HAVING BOOM SHIFTABLE VERTICALLY ALONG A LINEAR PATH {5}
204.~ By mounting on vertically extensible support

DEFINITION

Classification: 212/204

By mounting on vertically extensible support:

(under subclass 199) Apparatus wherein the structure supporting the boom* comprises a plurality of interconnected segments movable longitudinally with respect to one another to increase the length of the support and thereby raise the boom supported thereon.

SEE OR SEARCH THIS CLASS, SUBCLASS:

296, for a boom support comprising a plurality of telescoping segments and which is collapsible to a nonuse position.