Oct: Interception equipment at automatic exchanges; earlier and present standard equipment; use of interception equipment for filter purposes; etc. (See also - pt 1 Apr 1932 p 33-5)
Miscellaneous facilities at automatic and manual telephone exchanges
Post Office Elec Engrs' J
Post Office Electrical Engineers' Journal ; 25 , Part 3
1932
8 pages
Article (Journal)
English
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