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THE RELAY “tree,” so-called because of its configuration, is a special case of a multiterminal network of relay contacts in which a single input terminal may be connected to one of a number of output terminals. The path from each output terminal to the input end of the network passes through contacts on all the relays upon which the network is constructed; and no paths can be connected together. The particular path closed through depends upon the combination of operated relays.
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S. H. Washburn (1949) studied this question.
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