The telechronometer telephone service measurement in units of time Telephone service mesurement in units of time Cochran, Lyall Baker. creator text xx Seattle University of Washington 1941 monographic eng
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69 p. incl. illus., tables, diagrs. 23 cm. by Lyall Baker Cochran. Bibliographical foot-notes. Telephone Equipment and supplies Chronometers Telephone Rates TK6471 .C6 621.38796 Washington (State) University. Engineering experiment station. Engineering experiment series. Bulletin no. 104 po 41000004 U.S. Patent office. Libr. 790310 20260227111858.0 po 41000004