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公开(公告)号：US3544942A
公开(公告)日：1970-12-01
申请号：US3544942D
申请日：1969-05-01
Applicant: DANFOSS AS
Inventor： JOHNSEN INGOLF , JENSEN J GAMMELBY
IPC: G05D23/19 , G05D23/275 , H01H37/44 , H01H37/46 , H01H61/00
CPC classification number: G05D23/1921 , G05D23/275
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