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1953-03-24 |
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Frequency selector |
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1967-04-18 |
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Instrument for quantitating sound intensities |
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1946-09-18 |
1951-10-30 |
Rca Corp |
Electroacoustic transducer set
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GB732388A
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*
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1951-12-12 |
1955-06-22 |
Dictaphone Corp |
Twin unit stethoscope headphones
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BE518558A
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1952-03-20 |
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GB783945A
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1954-12-28 |
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DE1026480B
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1955-01-24 |
1958-03-20 |
Dr Emmanuel Roy Bier |
Breathing cannula with breath noise amplifier
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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 |
Hill Raymond R |
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 |
Baffoni; Frank A. |
Multiple phase acoustic systems
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2001-04-18 |
2002-10-25 |
Pneumopartners |
Analysis system for respiratory sounds includes sampling and processing module producing sound parameters for comparison with database
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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 |
Stethoscope using helmholtz resonance, method for controlling the same and method for manufacturing the same
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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 |
Mobile terminal system connected to stethoscope using helmholtz resonance, method for controlling the same and method for manufacturing the same
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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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