The details of the construction of the wooden frames for both the large and the small diaphragm, also the mounting of the loudspeaker unit.
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https://paperspast.natlib.govt.nz/periodicals/RADREC19290712.2.80.3
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Radio Record, Volume II, Issue 52, 12 July 1929, Page 36
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24The details of the construction of the wooden frames for both the large and the small diaphragm, also the mounting of the loudspeaker unit. Radio Record, Volume II, Issue 52, 12 July 1929, Page 36
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