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Gramophone pick-ups using a stylus Recorders using a stylus
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CPC
H04R21/04
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Parent Industries
H
ELECTRICITY
H04
Electric communication
H04R
LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS DEAF-AID SETS PUBLIC ADDRESS SYSTEMS
H04R21/00
Variable-resistance transducers
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H04R21/04
Gramophone pick-ups using a stylus Recorders using a stylus
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Patents Grants
last 30 patents
Information
Patent Grant
3691316
Patent number
3,691,316
Issue date
Sep 12, 1972
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
3673354
Patent number
3,673,354
Issue date
Jun 27, 1972
G01 - MEASURING TESTING
Information
Patent Grant
3501732
Patent number
3,501,732
Issue date
Mar 17, 1970
G01 - MEASURING TESTING
Information
Patent Grant
3475565
Patent number
3,475,565
Issue date
Oct 28, 1969
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
3392358
Patent number
3,392,358
Issue date
Jul 9, 1968
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
3378648
Patent number
3,378,648
Issue date
Apr 16, 1968
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
3295085
Patent number
3,295,085
Issue date
Dec 27, 1966
G01 - MEASURING TESTING
Information
Patent Grant
3182492
Patent number
3,182,492
Issue date
May 11, 1965
G01 - MEASURING TESTING
Information
Patent Grant
3138850
Patent number
3,138,850
Issue date
Jun 30, 1964
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
2786898
Patent number
2,786,898
Issue date
Mar 26, 1957
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
2769038
Patent number
2,769,038
Issue date
Oct 30, 1956
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
2711446
Patent number
2,711,446
Issue date
Jun 21, 1955
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
2711447
Patent number
2,711,447
Issue date
Jun 21, 1955
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
2703822
Patent number
2,703,822
Issue date
Mar 8, 1955
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
2671153
Patent number
2,671,153
Issue date
Mar 2, 1954
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
2648726
Patent number
2,648,726
Issue date
Aug 11, 1953
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
2645683
Patent number
2,645,683
Issue date
Jul 14, 1953
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
2590439
Patent number
2,590,439
Issue date
Mar 25, 1952
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
2568673
Patent number
2,568,673
Issue date
Sep 18, 1951
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
2545737
Patent number
2,545,737
Issue date
Mar 20, 1951
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
2511664
Patent number
2,511,664
Issue date
Jun 13, 1950
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
2511665
Patent number
2,511,665
Issue date
Jun 13, 1950
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
2491794
Patent number
2,491,794
Issue date
Dec 20, 1949
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
2482467
Patent number
2,482,467
Issue date
Sep 20, 1949
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
2476848
Patent number
2,476,848
Issue date
Jul 19, 1949
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
2472770
Patent number
2,472,770
Issue date
Jun 7, 1949
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
2471601
Patent number
2,471,601
Issue date
May 31, 1949
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
2429137
Patent number
2,429,137
Issue date
Oct 14, 1947
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
2415403
Patent number
2,415,403
Issue date
Feb 11, 1947
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
2382692
Patent number
2,382,692
Issue date
Aug 14, 1945
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Patents Applications
last 30 patents