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Teaching device

  • US 6,652,286 B1
  • Filed: 06/13/2002
  • Issued: 11/25/2003
  • Est. Priority Date: 06/13/2002
  • Status: Expired due to Fees
First Claim
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1. In combination with an overhead projection device, a teaching device, comprising:

  • a plurality of sheet members having first and second side portions and first and second end portions;

    a plurality of printed problems;

    only one of said plurality of problems being disposed on each of said sheet members;

    a plurality of printed solutions;

    only one of said plurality of solutions disposed on each of said sheet members;

    a plurality of first and second spaced-apart rail members connected to the first and second side portions of each of said sheet members; and

    a plurality of solution covers;

    only one of said plurality of solution covers being connected to each of said first rail members and positioned adjacent said solution to selectively prevent said solution from being optically received and projected by the overhead projection device while permitting said problem to be optically received and projected by the overhead projection device.

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