US PATENT SUBCLASS 235 / 80
.~.~.~ Keyless

Current as of: June, 1999
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235 /   HD   REGISTERS

61 R  DF  CALCULATORS {52}
77  DF  .~ Single axis {3}
79  DF  .~.~ Cylinder {3}
80.~.~.~ Keyless {1}
81 R  DF  .~.~.~.~> Lever operated {1}

DEFINITION

Classification: 235/80

(under subclass 79) Calculators whose registering devices comprise cylinders placed upon a single axis, these cylinders being operated directly by means of the fingers of the operator or by a stylus, pencil, or other instrument held in the hand.