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G09B—EDUCATIONAL OR DEMONSTRATION APPLIANCES; APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND, DEAF OR MUTE; MODELS; PLANETARIA; GLOBES; MAPS; DIAGRAMS
G09B29/00—Maps; Plans; Charts; Diagrams, e.g. route diagram
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Engineering & Computer Science
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Physics & Mathematics
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Theoretical Computer Science
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Mathematical Physics
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Business, Economics & Management
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Educational Administration
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Educational Technology
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General Physics & Mathematics
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Preparing Plates And Mask In Photomechanical Process
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