US PATENT SUBCLASS 235 / 70 D
.~.~.~ Slide rule pencils

Current as of: June, 1999
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235 /   HD   REGISTERS

61 R  DF  CALCULATORS {52}
69  DF  .~ Bar {1}
70 R  DF  .~.~ Slide rules {4}
70 D.~.~.~ Slide rule pencils

Unofficial Alpha Subclasses: R A B C D

DEFINITION

Classification: 235/70

(under subclass 69) Subject matter comprising rules consisting of a stationary base, and one or more slides

movable therein, both the base and the slides being graduated, usually logarithmically, according to the different elements of some mathematical formula, so that by placing the slide in proper relation to the base, problems embodying such formula may be solved without calculation.

SEE OR SEARCH THIS CLASS, SUBCLASS:

79.5, and 84, for other types of slide rules.