• All sections
• G - Physics
• G09B - Educational or demonstration appliancesappliances for teaching, or communicating with, the blind, deaf or mutemodelsplanetariaglobesmapsdiagrams
• G09B 3/10 - Manually- or mechanically-operated teaching appliances working with questions and answers of the multiple-choice answer type, i.e. where a given question is provided with a series of answers and a choice has to be made wherein one set of answers is common to a plurality of questions

Patent holdings for IPC class G09B 3/10

Total number of patents in this class: 3

10-year publication summary

Principal owners for this class