00456nam a2200157Ia 4500003000900000008004100009040001600050080001700066110002500083245008300108250001200191260004400203650001900247650002200266650001000288IN-BaIIA211028s9999    xx            000 0 eng d  cIIA Library  a621.383bSYL  aSylvania Radio Tubes 0aTechnical manualcSylvania Radio Tubes                                          a6th ed.  aPennabSylvania Electric Productsc1946  aNASA Thesaurus  aRadio Electronics  aTubes