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公开(公告)号:US2773130A
公开(公告)日:1956-12-04
申请号:US34597953
申请日:1953-03-31
Applicant: RCA CORP
Inventor: OLSON HARRY F , JOHN PRESTON
IPC: H04R1/22
CPC classification number: H04R1/222
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公开(公告)号:US2718272A
公开(公告)日:1955-09-20
申请号:US20330250
申请日:1950-12-29
Applicant: RCA CORP
Inventor: OLSON HARRY F , JOHN PRESTON
IPC: H04R9/08
CPC classification number: H04R9/08
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公开(公告)号:US2572376A
公开(公告)日:1951-10-23
申请号:US2984448
申请日:1948-05-28
Applicant: RCA CORP
Inventor: OLSON HARRY F , JOHN PRESTON
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14.Loudspeaker diaphragm support comprising plural compliant members 失效
Title translation: 扬声器隔膜支撑件包括多个顺从构件公开(公告)号:US2490466A
公开(公告)日:1949-12-06
申请号:US54567244
申请日:1944-07-19
Applicant: RCA CORP
Inventor: OLSON HARRY F , JOHN PRESTON
IPC: H04R7/20
CPC classification number: H04R7/20 , H04R2307/207
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公开(公告)号:US2468270A
公开(公告)日:1949-04-26
申请号:US57069944
申请日:1944-12-30
Applicant: RCA CORP
Inventor: OLSON HARRY F , JOHN PRESTON
CPC classification number: B06B1/08
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公开(公告)号:US3185767A
公开(公告)日:1965-05-25
申请号:US6153760
申请日:1960-10-10
Applicant: RCA CORP
Inventor: OLSON HARRY F , JOHN PRESTON
IPC: G10K15/10
CPC classification number: G10K15/10
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公开(公告)号:US2815823A
公开(公告)日:1957-12-10
申请号:US33980953
申请日:1953-03-02
Applicant: RCA CORP
Inventor: OLSON HARRY F , JOHN PRESTON
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公开(公告)号:US2699474A
公开(公告)日:1955-01-11
申请号:US20330150
申请日:1950-12-29
Applicant: RCA CORP
Inventor: OLSON HARRY F , JOHN PRESTON
IPC: H04R9/08
CPC classification number: H04R9/08
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公开(公告)号:US2699472A
公开(公告)日:1955-01-11
申请号:US17511250
申请日:1950-07-21
Applicant: RCA CORP
Inventor: OLSON HARRY F , JOHN PRESTON
IPC: H04R1/24
CPC classification number: H04R1/24
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20.Compressed metal powder phonograph records and methods of making same 失效
Title translation: 压缩金属粉末留声机记录及制作方法公开(公告)号:US2678895A
公开(公告)日:1954-05-18
申请号:US14043850
申请日:1950-01-25
Applicant: RCA CORP
Inventor: HERBERT BELAR , JOHN PRESTON
IPC: G11B3/70
CPC classification number: G11B3/70 , Y10T156/1041
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