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Gray Magnetic Relay Key, by Marconi Company, London, c. 1910
Inventory Number: 56506
Number of documents: 1
Document Type: Miscellaneous Note
Document Heading: Publication Details
Text:
This device was shown in W.W. Bradfield's article on Wireless Telegraphy for Marine Intercommunication in "The Electrician", 10 June 1910. The device was also further explained in Hawkhead's "Handbook of Technical Instruction for Wireless Telegraphists" (Marconi Press Agency).
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