US PATENT SUBCLASS 235 / 74
.~.~ Disk

Current as of: June, 1999
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235 /   HD   REGISTERS

61 R  DF  CALCULATORS {52}
72  DF  .~ Parallel axes {3}
74.~.~ Disk {1}
75 R  DF  .~.~.~> Key operated {1}

DEFINITION

Classification: 235/74

(under subclass 72) Calculating-machines whose registering attachments comprise disks placed upon axes parallel with each other, the disks being actuated by some instrument held in the hand, such as a stylus, pencil, etc.