US PATENT SUBCLASS 434 / 204
.~.~.~ Elements manually placed on or removed from elongate means during use

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

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

DEFINITION

Classification: 434/204

Elements manually placed on or removed from elongate means during use:

(under subclass 203) Subject matter wherein the apertured pieces are placed by hand on the wire, rod, or like means during instruction of a student.