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31.Mosaic construction for electroacoustical cylindrical transducers 失效
Title translation: 电声圆柱形换能器的马赛克结构公开(公告)号:US3177382A
公开(公告)日:1965-04-06
申请号:US8496461
申请日:1961-01-25
Applicant: GREEN CHARLES E
Inventor: GREEN CHARLES E
IPC: B06B1/06
CPC classification number: B06B1/0633
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公开(公告)号:US798133A
公开(公告)日:1905-08-29
申请号:US1905263615
申请日:1905-06-03
Applicant: GREEN CHARLES E , RICHEY JOHN R
Inventor: GREEN CHARLES E , RICHEY JOHN R
CPC classification number: B30B9/3053
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