11 Свободни изкуства за Telegraph Instruments Illustrations

PSM V03 D423 Morse telegraph
PSM V03 D431 Caselli telegraph
PSM V03 D427 Hughes printing telegraph
PSM V03 D424 Morse telegraph modified
PSM V03 D418 Single needle instrument
PSM V03 D429 Printing mechanism
PSM V03 D420 Mechanism of indicator
PSM V03 D425 Morse with relay
PSM V03 D428 Type and printing shaft
Muirhead automatic telegraph syphon receiver (Rankin Kennedy, Electrical Installations, Vol V, 1903)
Landells-Mark-Lane-
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