The tone-range of a small freeedge cone may be improved by the substitution of an eccentric-cone diaphragm, as Shown by dotted lines in Fig. 1. The details for cutting this are given in Fig. 2.
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https://paperspast.natlib.govt.nz/periodicals/RADREC19280921.2.72.3.1
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Radio Record, Volume II, Issue 10, 21 September 1928, Page 29
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35The tone-range of a small freeedge cone may be improved by the substitution of an eccentric-cone diaphragm, as Shown by dotted lines in Fig. 1. The details for cutting this are given in Fig. 2. Radio Record, Volume II, Issue 10, 21 September 1928, Page 29
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