Patent search ap:("BEATRICE EVELYN BYRD") AND inv:"O'BRIEN FRANCIS L" Page 1

1.

发明授权
Musical instruments 失效

公开(公告)号：US2925006A

公开(公告)日：1960-02-16

申请号：US29708952

申请日：1952-07-03

Applicant: BEATRICE EVELYN BYRD

Inventor： O'BRIEN FRANCIS L

IPC: G10C1/00

CPC classification number: G10C1/00 , G10C3/12

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