195198 ⎘
Manually or mechanically operated educational appliances using elements forming, or bearing, symbols, signs, pictures, or the like which are arranged or adapted to be arranged in one or more particular ways and having a support carrying or adapted to carry the elements the elements each bearing a plurality of different symbols, signs, or combinations of symbols and signs, only one symbol, sign, or combination thereof, of each element to be used at a time the elements being rotatable
Sub-classes:MULTI-LAYER TOY
#2Spinning 3D Geometric Shapes
#3Device for the representation of tactile characters
#4Method for efficiently teaching content using an adaptive engine and a physical input entry device
#5POLICE SCENE TRAINING APPARATUS
#6Method and apparatus for evaluating the effects of internal and external stress influences