File:Brevet 505.703 1918.pdf

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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current16:20, 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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