US PATENT SUBCLASS 212 / 349
.~.~ By fluid pressure

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

347  DF  BOOM OR MAST {1}
348  DF  .~ Extensible by sliding sections {2}
349.~.~ By fluid pressure

DEFINITION

Classification: 212/349

By fluid pressure:

(under subclass 348) Subject matter wherein the overall length of the member can be changed by application of a working fluid under pressure to the member or an associated motor.