US PATENT SUBCLASS 29 / 217
.~.~.~ Screw operated

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

700  DF  MEANS TO ASSEMBLE OR DISASSEMBLE {55}
213.1  DF  .~ Valve applying or removing {4}
215  DF  .~.~ Engine valve spring compressor (only) {3}
217.~.~.~ Screw operated {1}
218  DF  .~.~.~.~> Parallel or tong type, side entrance

DEFINITION

Classification: 29/217

Screw operated:

(under subclass 215) Apparatus in which the means for

developing the spring compressing force involves a screw.

SEE OR SEARCH THIS CLASS, SUBCLASS:

256+, for a screw operated means to assemble, generally.