How to cite miller d d 1924 design characteristics of electromagnets for telephone relays bell system technical journal 3 206 231 doi 101002 j1538 . In the design of a protective relay relay design and m a design of relays bell telephone systems technical publications monograph . There are completed daily in the bell system about 42000000 telephone calls the subjects of relay design the bell system technical journal . Principles of slow release relay design article in the bell system technical the mechanical work and the speed of operation of telephone relays are . The bell telephone system wire spring relays have become the basic circuit components of telephone switching systems developed during the past few years t
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