00313cam a2200169   450000500170000024500420001702000050005910000300006404400050009425000050009904100080010430000050011250000050011783000050012226000090012708200070013620260711133817.0  aVacuum-tube circuits and trasistorsb  a  aArguimbau, Lawrence Baker  a  a  aspa  a  a  v  abc  ab