File:Brevet 505.703 1918.pdf
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Brevet_505.703_1918.pdf (file size: 2.38 MB, MIME type: application/pdf)
Summary
French pattern filed by P. Langevin in 1918, in which he explicitly mentions use of piezoelectric effect for emission and reception. A translation in English is provided in the same reference.
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| Date/Time | Dimensions | User | Comment | |
|---|---|---|---|---|
| current | 16:20, 25 March 2020 | (2.38 MB) | Bleridon (talk | contribs) | French pattern filed by P. Langevin in 1918, in which he explicitly mentions use of piezoelectric effect for emission and reception. A translation in English is provided in the same reference. |
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