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File:Popular Science Musical Test, 1931.jpg

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Popular_Science_Musical_Test,_1931.jpg ‎(640 × 305 pixels, file size: 46 KB, MIME type: image/jpeg)

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current12:59, 2 January 2009Thumbnail for version as of 12:59, 2 January 2009640 × 305 (46 KB)wikimediacommons>Struthious Bandersnatch{{Information |Description=1931 article describing hearing tests done at the w:University of Iowa w:Child Welfare Research Station. Out of the magazine w:Popular Science. |Source=http://blog.modernmechanix.com/ [http://blog.modernmechanix.
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