US PATENT SUBCLASS 434 / 203
.~.~ Apertured elements threaded on elongate means (e.g., abacus, etc.)

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

188  DF  MATHEMATICS {4}
191  DF  .~ Arithmetic {17}
203.~.~ Apertured elements threaded on elongate means (e.g., abacus, etc.) {1}
204  DF  .~.~.~> Elements manually placed on or removed from elongate means during use

DEFINITION

Classification: 434/203

Apertured elements threaded on elongate means (e.g.., abacus, etc.):

(under subclass 191) Subject matter including apertured pieces through all of which a wire, a rod, or the like extends.