History of Science Museum: Collection Database Search

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15. Framed Wireless Telegraphy Notice, Britain, Mid 20th Century 16. Large Rotary Converter, by Electric Construction Company, English,... 17. Stud Field Regulating Rheostat, by Electric Construction Company,... 18. Stud Motor Starter, by Electric Construction Company, English,... 19. Pair Of Mounted Guard Lamps, Early 20th Century 20. Low Frequency Iron Core Inductance In Wooden Box, by Marconi... 21. Large Main Morse Key, by Marconi Company, London, Early 20th... 22. Magnetic Key Relay, by Marconi Company, London, Early 20th... 23. Large Main Condenser With Case, by Marconi Company, London,... 24. High Frequency Sliding Inductance, by Marconi Company, London,... 25. Assorted Copper Busbars And Ebonite Insulators, Early 20th...