File:PSM V25 D270 Sound energy generator and sound radio meter.jpg

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Description Sound energy generator and sound radio meter
Date
Source Popular Science Monthly Volume 25
Author Unknown authorUnknown author
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current20:02, 2 September 2010Thumbnail for version as of 20:02, 2 September 20101,540 × 1,153 (140 KB)Ineuw{{Information |Description = Sound energy generator and sound radio meter |Source = http://en.wikisource.org/wiki/Page:Popular_Science_Monthly_Volume_25.djvu/270 |Date = 1884 |Author = Unknown |Permission = {{PD-old}} |other_versions = }} [[Categor

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