International Library of Technology · Scranton, International Textbook Co. · leaf 698
ded to be used torestore the indicators totheir normal positionwhen the call is answered.A view of the indicatoritself is given in Fig. 10.A hinged arm a carries acard bearing the nameor number of the roomto which the drop is .con-nected, and is held up inthe position shown by acounterbalanced trip… … Fig. 9. the openings
Electrical engineering
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