A response curve and (inse[?]) 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/RADREC19290712.2.80.5
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Radio Record, Volume II, Issue 52, 12 July 1929, Page 37
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25A response curve and (inse[?]) 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 52, 12 July 1929, Page 37
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