000 003050000a22001330004500
008 140223b1950 xxu||||| |||| 00| 0 eng d
041 _aENG
080 _aD657 J0
082 _aD657 J0
100 _aLawson (J L)
245 _aThershold singnlas
260 _c1950
650 _aEleectron Engineering
999 _c155283
_d155283