A General Theory of Electric Wave Filters, Bell Telephone System Monograph B-843, Telephone Equipment, no date circa 1934.
Bell Telephone Laboratories, 88 pages, diagrams.
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Ideal Wave Filters, Bell Telephone System technical publications, Monograph B-856, no date, circa 1935; front cover states, Telephone Equipment, in place where date usually is.
Bell Telephone Laboratories, published in BSTJ April 1935, 38 pages.
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