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Compensated galvanometer
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Patent number 4,066,958
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Issue date Jan 3, 1978
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MFE Corporation
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Edward Burke
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G01 - MEASURING TESTING
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Level meter for sound signals
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Patent number 3,991,628
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Issue date Nov 16, 1976
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Kabushiki Kaisha Nihon Keiki Seisakusho
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Shizuo Narita
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G01 - MEASURING TESTING
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3899736
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Patent number 3,899,736
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Issue date Aug 12, 1975
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G01 - MEASURING TESTING
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3891923
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Patent number 3,891,923
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Issue date Jun 24, 1975
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G01 - MEASURING TESTING
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3878462
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Patent number 3,878,462
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Issue date Apr 15, 1975
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G01 - MEASURING TESTING
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3406339
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Patent number 3,406,339
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Issue date Oct 15, 1968
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G01 - MEASURING TESTING
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3041536
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Patent number 3,041,536
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Issue date Jun 26, 1962
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G01 - MEASURING TESTING
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1624135
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Patent number 1,624,135
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Issue date Apr 12, 1927
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G01 - MEASURING TESTING
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1472198
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Patent number 1,472,198
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Issue date Oct 30, 1923
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F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...