Specifications for the multiplex printing telegraph system : theory and operation (1920)
Western Union Telegraph Company · [New York?] : The Company · leaf 76
t may be engaged by a latch controlled by a lever extending outside the transmittercover. 11. When this lever is in the position shown in Figure 3A the latch is thrown to theright, away from the hook on the end of the armature extension. If, however, the leverbe thrown to the position shown in…
Telegraph
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