Two drawings showing complete mechanical details of home-made speaker unit.
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https://paperspast.natlib.govt.nz/periodicals/RADREC19280810.2.55.1
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Radio Record, Volume II, Issue 4, 10 August 1928, Page 30
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10Two drawings showing complete mechanical details of home-made speaker unit. Radio Record, Volume II, Issue 4, 10 August 1928, Page 30
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