Improvements relating to apparatus for operating devices having a negative resistance characteristic from an alternating electric current supply circuit
摘要
申请公布号
GB627646(A)
申请公布日期
1949.08.12
申请号
GB19470012496
申请日期
1947.05.08
申请人
WESTINGHOUSE BRAKE & SIGNAL COMPANY LIMITED;ALEC HERVEY BENNETT WALKER
