00605nam a22001811  4500003000900000005001700009008004100026010001700067040003700084082001500121100002500136245004100161260004500202300004600247440006100293504005100354650001800405BD-KhUET20120723143027.0120723s1948    nyua     b    001 0 eng    a   48001249   aDLCcODaWUdOCoLCdDLCdBD-KhUET  a621.3841321 aSpangenberg, Karl R.10aVacuum tubes /cKarl R. Spangenberg.  aNew York :bMcGraw-Hill Book Co.,c1948.  axvii, 860 p. :billus., diagrs. ;c24 cm. 0aMcGraw-Hill electrical and electronic engineering series  aIncludes bibliographical references and index. 0aVacuum-tubes.