US PATENT SUBCLASS 29 / 256
.~.~ Having screw operator

Current as of: June, 1999
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29 /   HD   METAL WORKING

700  DF  MEANS TO ASSEMBLE OR DISASSEMBLE {55}
244  DF  .~ Puller or pusher means, contained force multiplying operator {11}
256.~.~ Having screw operator {2}
257  DF  .~.~.~> C-frame
258  DF  .~.~.~> Central screw, work-engagers around screw {3}

DEFINITION

Classification: 29/256

Having screw operator:

(under subclass 244) Apparatus in which a screw is operated to develop the assembling or disassembling force.

SEE OR SEARCH THIS CLASS, SUBCLASS:

217+, for a screw operated engine valve spring compressor.

250, for a machine key extractor or inserter.