00423nam a22001457a 4500 BD-DhUL 20140924112554.0 140924s1920 xxua|||| |||| 001 0 eng d BD-DhUL BD-DhUL 537.53 BIT Bijl, H. J. Van Der . The thermionic vacuum tube and its applications / by H. J. Van Der Bijl. New York : McGraw-Hill Book, 1920. ddc BK 12692 12692 0 0 ddc 0 537_530000000000000_BIT 0 NFIC 22703 DUSL DUSL GEN 2014-09-24 Purchased 537.53 BIT 36054 2014-09-24 2014-09-24 BK