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1967-04-18 |
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Instrument for quantitating sound intensities |
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1953-03-24 |
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Frequency selector |
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1946-09-18 |
1951-10-30 |
Rca Corp |
Electroacoustic transducer set
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1951-12-12 |
1955-06-22 |
Dictaphone Corp |
Twin unit stethoscope headphones
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1952-03-20 |
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1954-12-28 |
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1955-01-24 |
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1965-01-25 |
1966-12-27 |
Telex Corp |
Compressional wave signaling apparatus
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1967-12-26 |
1970-02-03 |
Us Navy |
Single tubing stethoscope
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1971-07-30 |
1972-09-12 |
Bio Data Inc |
Selective frequency stethoscope structure
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1979-07-02 |
1981-06-02 |
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Stethoscope with probe sound pick-up and resonant cavity amplification
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1979-09-25 |
1981-01-27 |
Cornell Thompson |
Leak scope for detecting leaks in plumbing equipment
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1981-10-06 |
1983-06-14 |
Hill Raymond R |
Stethoscope with improved resonant cavity amplification
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1984-07-05 |
1988-08-16 |
Etymotic Research, Inc. |
Insert earphones for audiometry
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1985-11-06 |
1987-01-06 |
Minnesota Mining And Manufacturing Company |
Stethoscope with high frequency filter
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1993-12-03 |
1996-02-20 |
Greenberger; Hal |
Noise-reducing stethoscope
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1995-05-12 |
1996-06-25 |
Baffoni; Frank A. |
Multiple phase stethoscope
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1997-06-24 |
2000-09-19 |
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Pneumopartners |
Dispositif d'aide a l'analyse de bruits adventices
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2013-10-02 |
2016-08-02 |
Andrew Tien |
Stethescope based leak detection apparatus with interchangeable heads
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2015-04-30 |
2016-07-07 |
서울시립대학교 산학협력단 |
헬름홀츠 공명을 이용한 청진기, 그 제어방법 및 그 제조방법
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WO2016186849A1
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2015-05-15 |
2016-11-24 |
3M Innovative Properties Company |
Stethoscope
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2015-06-02 |
2017-01-17 |
서울시립대학교 산학협력단 |
헬름홀츠 공명을 이용한 청진기와 연결되는 휴대단말 시스템, 그 제어방법 및 그 제조방법
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USD814631S1
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2015-09-21 |
2018-04-03 |
3M Innovative Properties Company |
Stethoscope with one-piece tubing, chest piece and diaphragm-rim
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