Figs. 1 and 2 showing how voltage regulating devices maintain voltage at a constant figure.
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https://paperspast.natlib.govt.nz/periodicals/RADREC19311023.2.40.2
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Radio Record, Volume V, Issue 15, 23 October 1931, Page 16
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15Figs. 1 and 2 showing how voltage regulating devices maintain voltage at a constant figure. Radio Record, Volume V, Issue 15, 23 October 1931, Page 16
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