00687cam a22002291 4500 13833 BD-RjUL 20211208235524.0 140202s1953 enka 001 0 eng d (BD-RjUL)13885 DLC DLC DLC BD-RjUL eng eng 621.384132 BET 1953 Beck, A. H. W. (Arnold Hugh William), 1916- 43255 Thermionic valves : their theory and design / A. H. W. Beck, Cambridge [Eng.] : University Press, c1953. xvi, 570 p. : illus. ; 21 cm. Vacuum-tubes. 43256 ddc BK 13833 13833 0 0 ddc 0 0 NFIC RUCL RUCL Stack 1961-03-11 Colombo Plan 0 621.384132 BET 1953 2014-02-02 00:00:00 C-2 2014-02-02 BK 0 0 ddc 0 0 NFIC RUCL RUCL Stack 1959-05-08 B.H. Black well 3.10 0 621.384132 BET 1953 2014-02-06 00:00:00 C-2 2014-02-06 BK