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
G09B29/10—Map spot or coordinate position indicators; Map reading aids
G09B29/102—Map spot or coordinate position indicators; Map reading aids using electrical means
Landscapes
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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Circuit Arrangement For Electric Light Sources In General
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Electric Wiring, Fittings, Switches, and Lamps: A Practical Book for Electric-light Engineers, Contractors, Consulting Engineers, Architects, Builders, Wiremen, and Students. A Supplement to the Same Author's" Electric Lightning and Power Distribution."