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Specifications for the multiplex printing telegraph system : theory and operation (1920)
Western Union Telegraph Company · [New York?] : The Company · leaf 192
Page 19 Section 5-A Adjustments Multiplex System 263-C … LETTERED CIRCLESINDICATE HOLES INPRINTER BASE SEEFIG 51. Fig. 50 Page 20 Section 5-A Adjustments Multiplex System 263-CTelegraph
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