Improvements relating to arrangements for switching automatically from a normal source of electrical energy supply to a stand-by source on interruption of the former
摘要
申请公布号
GB541884(A)
申请公布日期
1941.12.16
申请号
GB19400010298
申请日期
1940.06.13
申请人
STANDARD TELEPHONES AND CABLES LIMITED;JOHN DOUGLAS HOLLAND
