Figure 1.—The top photo represents an unused record. The centre a record that has been played by a standard mechanical soundbox 50 times. The lower photo shows the amount of record collected by the needle from the record. (See text.)
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https://paperspast.natlib.govt.nz/periodicals/RADREC19300228.2.81.1.1
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Radio Record, Volume III, Issue 33, 28 February 1930, Page 34
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40Figure 1.—The top photo represents an unused record. The centre a record that has been played by a standard mechanical soundbox 50 times. The lower photo shows the amount of record collected by the needle from the record. (See text.) Radio Record, Volume III, Issue 33, 28 February 1930, Page 34
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