US PATENT SUBCLASS 235 / 78 R
.~.~ Concentric disk

Current as of: June, 1999
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235 /   HD   REGISTERS

61 R  DF  CALCULATORS {52}
77  DF  .~ Single axis {3}
78 R.~.~ Concentric disk {6}
78 A  DF  .~.~.~> Adders
78 F  DF  .~.~.~> Financial
78 G  DF  .~.~.~> Games
78 M  DF  .~.~.~> Mathematics
78 N  DF  .~.~.~> Navigation
78 RC  DF  .~.~.~> Rhythm calculators

Unofficial Alpha Subclasses: R A F G M N RC

DEFINITION

Classification: 235/78

(under subclass 77) Calculating-machines whose registering devices comprise a plurality of disks numbered on their faces and mounted in a base, said disks being placed concentrically on a single shaft or axis.

SEE OR SEARCH THIS CLASS, SUBCLASS:

41, and 116, for other concentric disk devices.