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公开(公告)号:US1803278A
公开(公告)日:1931-04-28
申请号:US29486828
申请日:1928-07-23
Applicant: CASE RES LAB INC
Inventor: WILLARD CASE THEODORE
IPC: H04N5/84
CPC classification number: H04N5/84
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公开(公告)号:US1759434A
公开(公告)日:1930-05-20
申请号:US17291127
申请日:1927-03-04
Applicant: CASE RES LAB INC
Inventor: WILLARD CASE THEODORE
IPC: G11B7/00
CPC classification number: G11B7/00
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43.Method and apparatus for translating or transmitting sound waves 失效
Title translation: 用于翻译或传输声波的方法和装置公开(公告)号:US1718999A
公开(公告)日:1929-07-02
申请号:US59311022
申请日:1922-10-07
Applicant: CASE RES LAB INC
Inventor: WILLARD CASE THEODORE
IPC: H04B10/00
CPC classification number: H04B10/00
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公开(公告)号:US1605529A
公开(公告)日:1926-11-02
申请号:US3420625
申请日:1925-06-01
Applicant: CASE RES LAB INC
Inventor: WILLARD CASE THEODORE
IPC: G11B7/00
CPC classification number: G11B7/00
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公开(公告)号:US1605526A
公开(公告)日:1926-11-02
申请号:US882725
申请日:1925-02-12
Applicant: CASE RES LAB INC
Inventor: WILLARD CASE THEODORE
IPC: G11B7/00
CPC classification number: G11B7/00
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公开(公告)号:US1593690A
公开(公告)日:1926-07-27
申请号:US61100323
申请日:1923-01-06
Applicant: CASE RES LAB INC
Inventor: WILLARD CASE THEODORE
IPC: G11B3/00
CPC classification number: G11B3/00
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47.
公开(公告)号:US1588170A
公开(公告)日:1926-06-08
申请号:US67232423
申请日:1923-11-02
Applicant: CASE RES LAB INC
Inventor: WILLARD CASE THEODORE
IPC: H04R23/00
CPC classification number: H04R23/002
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