Revision history of "Willis's Indicators"

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  • (cur | prev) 09:40, 17 July 2015‎ Tone (Talk | contribs)‎ . . (1,053 bytes) (+1,053)‎ . . (Created page with "'''Willis Indicators''' were a family of electrical data instruments under development and trial in the late 1880s that could transmit and receive a variety of information, su...")
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