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This article is from Newnes' 'Complete Electrical Engineering', Vol.3 I estimate it to be from the 1940s or 1950s
Thanks to Chris Colebrook for sending this article from "The Practical
Electrical Engineer" April 1933. This page, describing a grid-controlled MAR is from "Power Wiring Diagrams" (A.T.Dover) 3rd edition 1936 (Reprinted 1952)
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