Period

5 results for: radio sounds

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Photograph of a technician holding a laser 'demodulator' used to convert laser light beams into television signals and radio sounds
ARP23A16_039

Photograph of a technician holding a laser 'demodu...

Photograph of a technician holding a laser 'demodulator' used to convert laser light beams into television signals and radio sounds
ARP23A16_038

Photograph of a technician holding a laser 'demodu...

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

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

thermionic tube or thermionic valve
ARP18A30_304

thermionic tube or thermionic valve

thermionic tube or thermionic valve
ARP18A30_303

thermionic tube or thermionic valve