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公开(公告)号：US1271685A
公开(公告)日：1918-07-09
申请号：US8149016
申请日：1916-03-01
Applicant: ENDER JAMES E , CROMPTON LIONEL W , BURGERT WILLARD C
Inventor： ENDER JAMES E , CROMPTON LIONEL W , BURGERT WILLARD C
CPC classification number: G03B17/24
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