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Manipulatable teaching aid

  • US 3,117,384 A
  • Filed: 03/14/1962
  • Issued: 01/14/1964
  • Est. Priority Date: 03/14/1962
  • Status: Expired due to Term
First Claim
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1. AN ARTICLE FOR TEACHING ARITHEMETIC COMPRISING A SOLID OF SUBSTANTIALLY SPHERICAL SHAPE DIVIDED INTO SEPARABLE PORTIONS HAVING CONFRONTING PLANAR SURFACES IN CLOSE JUXTAPOSITION WHEN ASSEMBLED TO FORM SAID SHAPE, SAID SURFACES HAVING SHEET MATERIAL AFFIXED THEREON FOR RELEASABLY HOLDING SAID PORTIONS IN SECURE COOPERATING RELATIONSHIP WHEN ASSEMBLED TO FORM SAID SOLID, SAID MATERIAL COMPRISING A PLURALITY OF MINUTE HOOKS AND LOOPS ADAPTED TO OPERATIVELY ENGAGE EACH OTHER AND REMAIN THUS ENGAGED UNTIL SEPARATED BY SUBSTANTIAL EXTERNAL FORCE APPLIED TO SAID PORTIONS, SAID SEPARABLE PORTIONS BEING DEFINED BY AT LEAST ONE PLANE OF SEPARATION PASSING THROUGH THE GEOMETRIC CENTER OF SAID SOLID, AND AN INDENTED AREA IN THE EXTERNAL SURFACE OF SAID SOLID, SAID PLANE PASSING THROUGH SAID AREA SO THAT GENERALLY OPPOSING FORCES APPLIED TO SAID AREA IN A DIRECTION GENERALLY AWAY FROM SAID PLANE AND ON OPPOSITE SIDES THEREOF CAUSE SEPARATION OF SAID PORTIONS FROM EACH OTHER WHEREBY SAID SOLID IS DISASSEMBLED.

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