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Water level recorder
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Patent number 4,200,876
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Issue date Apr 29, 1980
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Systron Donner Corporation
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John D. Gearheart
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G01 - MEASURING TESTING
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Event stacker and display device
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Patent number 4,017,836
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Issue date Apr 12, 1977
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The United States of America as represented by the Secretary of the Navy
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Wesley R. Paulson
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G01 - MEASURING TESTING
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3631509
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Patent number 3,631,509
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Issue date Dec 28, 1971
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G06 - COMPUTING CALCULATING COUNTING
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3460155
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Patent number 3,460,155
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Issue date Aug 5, 1969
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G01 - MEASURING TESTING
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3405213
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Patent number 3,405,213
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Issue date Oct 8, 1968
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G09 - EDUCATION CRYPTOGRAPHY DISPLAY ADVERTISING SEALS
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3258775
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Patent number 3,258,775
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Issue date Jun 28, 1966
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G01 - MEASURING TESTING
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3169820
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Patent number 3,169,820
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Issue date Feb 16, 1965
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G01 - MEASURING TESTING
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2849272
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Patent number 2,849,272
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Issue date Aug 26, 1958
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G05 - CONTROLLING REGULATING
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2749204
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Patent number 2,749,204
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Issue date Jun 5, 1956
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G01 - MEASURING TESTING
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2673136
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Patent number 2,673,136
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Issue date Mar 23, 1954
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G01 - MEASURING TESTING