00767nam a2200265 4500 5094 5094 2672868 OSt 20200101100129.0 730705s1973 enka b 001 0 eng 73163567 B73-08348 040870344X DLC DLC DLC TK6161 .R52 1973b 621.385 RIC 23 Richards, D. L. Telecommunication by speech: the transmission performance of telephone networks [by] D. L. Richards. London, Butterworths, 1973. [24], 589 p. illus. 24 cm. £12.00 Bibliography: p. 529-577. Telephone. 7 cbc orignew 3 ncip 19 y-gencatlg ddc STS 0 0 ddc 0 0 98/3 AIISH AIISH 2020-01-01 0 621.385 RIC 1781 2020-01-01 00:00:00 2020-01-01 STS