TREA

Manually or mechanically operated teaching appliances working with questions and answers

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Industry

  • CPC
  • G09B3/00
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Parent Industries

GPHYSICS G09Cryptography, education, displays G09BEDUCATIONAL OR DEMONSTRATION APPLIANCES APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND, DEAF OR MUTE MODELS PLANETARIA GLOBES MAPS DIAGRAMS

Current Industry

G09B3/00Manually or mechanically operated teaching appliances working with questions and answers

Sub Industries

G09B3/02of the type wherein the student is expected to construct an answer to the question which is presented or wherein the machine gives an answer to the question presented by a student G09B3/04of chart form G09B3/045with invisibly printed correct answer; the answer being rendered visible by special optical means G09B3/06of the multiple-choice answer type G09B3/08of chart form G09B3/085with invisibly printed correct answer; the answer being rendered visible by special optical means G09B3/10wherein one set of answers is common to a plurality of questions G09B3/12of chart form
Industries

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Patents Applicationslast 30 patents