• All sections
• G - Physics
• G09B - Educational or demonstration appliances; appliances for teaching, or communicating with, the blind, deaf or mute; models; planetaria; globes; maps; diagrams
• G09B 1/20 - 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 and bearing the symbols on a surface parallel to the axis of rotation

Patent holdings for IPC class G09B 1/20

Total number of patents in this class: 2

10-year publication summary

Principal owners for this class