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Title: Procédé et disposition améliorant l'efficacité des projecteurs ultra-sonores piézo-électriques, Brevet francais, n 662 035 du 27 janvier 1926

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Last modified:

Mar 17, 2022

In our library since:

Jul 1, 2021

Number of object content downloads / hits:

18

All available object's versions:

https://www.rcin.org.pl/impan/publication/226864

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