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Kragh, H., "The Krarup [what is control cable](https://capdiensaigon.xyz/2021/04/12/cach-chon-cap-tin-hieu-chat-luong-tot-theo-nhu-cau/ "what is control cable"): Invention and early development", Technology and Culture, vol. Heaviside, O, Electrical Papers, vol. The Electrician, 1887 and reproduced (according to Brittain) in Heaviside, O, Electromagnetic Theory, p.
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