File:PSM V49 D127 Dividing engine for ruling gratings for spectrum anayzers 1895.jpg
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 05:41, 26 March 2011 | 2,838 × 1,718 (1.02 MB) | Ineuw | {{Information |Description = Dividing engine for ruling gratings for spectrum analyzers - 1895/ |Source = [http://www.archive.org/details/popularsciencemo49newy Popular Science Monthly Volume 49] |Date = 1896 |Author = Unk |
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