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Sampling method and apparatus
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Patent number 4,010,647
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Issue date Mar 8, 1977
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The United States of America as represented by the Secretary of the Interior
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Fred N. Kissell
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G01 - MEASURING TESTING
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3546945
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Patent number 3,546,945
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Issue date Dec 15, 1970
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G01 - MEASURING TESTING
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2957673
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Patent number 2,957,673
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Issue date Oct 25, 1960
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G01 - MEASURING TESTING
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2943479
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Patent number 2,943,479
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Issue date Jul 5, 1960
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G01 - MEASURING TESTING
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2943478
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Patent number 2,943,478
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Issue date Jul 5, 1960
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G01 - MEASURING TESTING
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2875615
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Patent number 2,875,615
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Issue date Mar 3, 1959
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G01 - MEASURING TESTING
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2682772
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Patent number 2,682,772
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Issue date Jul 6, 1954
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G01 - MEASURING TESTING
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2435608
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Patent number 2,435,608
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Issue date Feb 10, 1948
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G01 - MEASURING TESTING
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2215706
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Patent number 2,215,706
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Issue date Sep 24, 1940
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G01 - MEASURING TESTING