Primary test boards are means provided for quickly locating faults as they occur in outside toll plant; their use results in considerable economies by reducing out-of-service periods and by permitting repairs to be made when their cost is slight; equipment developed by Bell Laboratories.
Primary toll test boards
Bell Laboratories Rec
Bell Laboratories Record ; 13 , n 8
1935
5 pages
Diagrams
Article (Journal)
English
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