US PATENT SUBCLASS 235 / 75 R
.~.~.~ Key operated

Current as of: June, 1999
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61 R  DF  CALCULATORS {52}
72  DF  .~ Parallel axes {3}
74  DF  .~.~ Disk {1}
75 R.~.~.~ Key operated {1}
75 T  DF  .~.~.~.~> Thomas-type machines

Unofficial Alpha Subclasses: R T

DEFINITION

Classification: 235/75

(under subclass 74) Calculating-machines, wherein the disks are each operated by means of keys.