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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...

A combined Semaphore and Light Railway Signal
ARP23A18_316

A combined Semaphore and Light Railway Signal