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Soil penetrometer
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Patent number 5,663,649
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Issue date Sep 2, 1997
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Her Majesty The Queen in right of Canada, as represented by Agriculture and A...
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Clarke Topp
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E02 - HYDRAULIC ENGINEERING FOUNDATIONS SOIL SHIFTING
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3826980
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Patent number 3,826,980
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Issue date Jul 30, 1974
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G01 - MEASURING TESTING
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3778706
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Patent number 3,778,706
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Issue date Dec 11, 1973
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G01 - MEASURING TESTING
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3675121
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Patent number 3,675,121
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Issue date Jul 4, 1972
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G01 - MEASURING TESTING