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公开(公告)号：US2055619A
公开(公告)日：1936-09-29
申请号：US73194634
申请日：1934-06-22
Applicant: STANDARD OIL DEV CO
Inventor： BLAU LUDWIG W , WATT JAMES S
IPC: H03H11/12
CPC classification number: H03H11/12
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