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100   $a20020821d1920----km-y0itay50------ba
101 0 $aeng
105   $aa-------001yy
200 1 $a<<The >>thermionic vacuum tube and its applications$fby H. J. Van Der Bijl
210   $aNew York ; London$cMcGraw-Hill$d1920
215   $a391 p.$cill.$d24 cm
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700  1$aVan der Bijl,$bH. J.$0491782
801  0$aIT$bUNINA$gRICA$2UNIMARC
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952   $a10 E I 32$b2220$fDINEL
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996   $aThermionic vacuum tube and its applications$9333012
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