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6 résultats pour : morse key

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A train dispatcher using a Morse key to send a message down the line on the railway telegraph system
ARP23A18_139

A train dispatcher using a Morse key to send a mes...

Morse electric printing telegraph
ARP07104_460001303

Morse electric printing telegraph

Morse electric printing telegraph
ARP07104_460001304

Morse electric printing telegraph

Telegraph office viewed from street including man reading message he has received
ARP07104_460001305

Telegraph office viewed from street including man ...

Operator sending a message on a Morse electric printing telegraph
ARP07104_460001307

Operator sending a message on a Morse electric pri...

Guglielmo Marconi pionnier des transmissions par radio
ARP07093_390000082

Guglielmo Marconi pionnier des transmissions par r...