Période

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Heinrich Hertz's oscillator and reflecting metal sheets to show outward and return paths of electromagnetic
ARP23A18_254

Heinrich Hertz's oscillator and reflecting metal s...

Heinrich Hertz's oscillator and reflecting metal sheets to show outward and return paths of electromagnetic
ARP23A18_253

Heinrich Hertz's oscillator and reflecting metal s...

Heinrich Hertz's oscillator and reflecting metal sheets to show outward and return paths of electromagnetic
ARP23A18_252

Heinrich Hertz's oscillator and reflecting metal s...

Cover to the 1924 march edition of 'Practical Electrics'.
ARP18A12_439

Cover to the 1924 march edition of 'Practical Elec...

Listening to the Radio
ARP18A07_476

Listening to the Radio