US PATENT SUBCLASS 434 / 215
.~.~ Demonstration means using relatively turnable elements

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434 /   HD   EDUCATION AND DEMONSTRATION

188  DF  MATHEMATICS {4}
211  DF  .~ Geometry, trigonometry, or physical mathematic model structure {5}
215.~.~ Demonstration means using relatively turnable elements

DEFINITION

Classification: 434/215

Demonstration means using relatively turnable elements:

(under subclass 211) Subject matter demonstrated by a means

including elements that turn relative to each other.