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Drill rig assembly
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Patent number 4,938,296
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Issue date Jul 3, 1990
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Pacer Works, Ltd.
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James W. Brazell
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E21 - EARTH DRILLING MINING
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Rock breaking device
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Patent number 4,759,412
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Issue date Jul 26, 1988
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James W. Brazell
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E02 - HYDRAULIC ENGINEERING FOUNDATIONS SOIL SHIFTING
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Wheelchair anti-rollback mechanism
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Patent number 4,538,825
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Issue date Sep 3, 1985
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Georgia Tech Research Institute
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Ronald D. Delahoussaye
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A61 - MEDICAL OR VETERINARY SCIENCE HYGIENE
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