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Specifications for the multiplex printing telegraph system : theory and operation (1920)
Western Union Telegraph Company · [New York?] : The Company · leaf 253
6f-h PULSERELAY 6+J? PULSE CONTACT CLOSER BY MECHAN-ICAL CUT-OUT WHEN SELECTION IS MAPE. ^,TOBELLCJCX41 SOLENOIP THIS CONTACT CLOSES WHENEVER THE UNIVERSAL BAR IS OPERATEP SPACINGCONTACT … THIS CONT. ISOPENEP BY THE JPULL BAR AFTERTHE CAR. HAS BEENSHIFTEP TO THEUPPER CASE ©,T^rDOPERATING THIS CONTACTCLOSES WHEN THESELECTOR BAR RE-Telegraph
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