US PATENT SUBCLASS 434 / 191
.~ Arithmetic


Current as of: June, 1999
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434 /   HD   EDUCATION AND DEMONSTRATION

188  DF  MATHEMATICS {4}
191.~ Arithmetic {17}
192  DF  .~.~> Chalkboard or equivalent means having readily erasable surface
193  DF  .~.~> Manually manipulated numeral shaped elements
194  DF  .~.~> Numeric value represented by weight placed on balance
195  DF  .~.~> Manually manipulated elements having size proportional to numeric value {1}
197  DF  .~.~> Indicia-bearing belt or reel-mounted strip
198  DF  .~.~> Plaque (e.g., disk, etc.) turnable relative to index (e.g., window in card, etc.) to selectively align different points on plaque therewith
199  DF  .~.~> Plaque slidable relative to index (e.g., window in card, etc.) to selectively align different points on plaque therewith
200  DF  .~.~> Manually manipulated pin or peg
201  DF  .~.~> Electric component included in teaching means
202  DF  .~.~> Keyboard or like manually manipulated array (e.g., slides, levers, etc.)
203  DF  .~.~> Apertured elements threaded on elongate means (e.g., abacus, etc.) {1}
205  DF  .~.~> Means having number of marks (e.g., dots, etc.) or associated physical units (e.g., sticks, indentations, etc.) corresponding to numeric value
206  DF  .~.~> Rotatable wheel-shaped element (e.g., ring, disc, cylinder, etc.) having indicia on perimeter thereof
207  DF  .~.~> Color used in teaching means
208  DF  .~.~> Ball, block, or disk
209  DF  .~.~> Division or multiplication
210  DF  .~.~> Place value relative to decimal point


DEFINITION

Classification: 434/191

Arithmetic:

(under subclass 188) Subject matter relating to computations with real numbers.