00869cam a22002891 4500 7426578 BD-DhUL 20150219211630.0 760107s1950 enka b 001 0 eng 50012149 GB50-1431 (OCoLC)1915153 DLC NCaS OCoLC Uk DLC BD-DhUL premarc QC661 .S36 1950 621.3 SCI Scowen, F. An introduction to the theory and design of electric wave filters / With a foreword by Sir Archibald J. Gill. 2nd ed., rev. London : Chapman & Hall, c1950. xi, 188 p. : diagrs. ; 23 cm. Bibliography: p. 183-184. Electric waves. Electric filters. 7 cbc oclcrpl u ncip 19 y-gencatlg ddc BK 32852 32852 0 0 ddc 0 621_300000000000000_SCI 0 NFIC 61595 DUSL DUSL GEN 2015-01-18 Purchased 621.3 SCI 54775 2015-01-18 2015-01-18 BK