A response curve and (inset) a sectional sketch showing the mounting of the two vibrating membranes. A, working diaphragm; B balancing diaphragm; C, driving unit.
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https://paperspast.natlib.govt.nz/periodicals/RADREC19280817.2.66.1
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Radio Record, Volume II, Issue 5, 17 August 1928, Page 30
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25A response curve and (inset) a sectional sketch showing the mounting of the two vibrating membranes. A, working diaphragm; B balancing diaphragm; C, driving unit. Radio Record, Volume II, Issue 5, 17 August 1928, Page 30
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