Specifications for the multiplex printing telegraph system : theory and operation (1920)
Western Union Telegraph Company · [New York?] : The Company · leaf 243
returning the carriage is a mechanical process and follows di-rectly after the attraction of the carriage return armature (Fig. 8). The carriage issupported at three points on ball bearings. At the rear of the upper ball race is a rack,cut with a rounded face so as to work equally well in the lower…
Telegraph
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