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Mine roof supports
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Patent number 5,423,638
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Issue date Jun 13, 1995
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Gullick Dobson Limited
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Colin G. M. Merriman
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E21 - EARTH DRILLING MINING
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Mine roof supports
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Patent number 5,039,257
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Issue date Aug 13, 1991
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Gullick Dobson Limited
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Tom C. Bithell
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E21 - EARTH DRILLING MINING
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Hydraulic power generating pack
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Patent number 4,941,807
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Issue date Jul 17, 1990
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Gullick Dobson Limited
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Malcolm C. Foster
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F04 - POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS PUMPS FOR LIQUIDS OR ELASTIC...
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Mine roof supports
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Patent number 4,797,023
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Issue date Jan 10, 1989
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Gullick Dobson Limited
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Roy Park
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E21 - EARTH DRILLING MINING
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Mine roof supports
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Patent number 4,792,261
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Issue date Dec 20, 1988
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Gullick Dobson Limited
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Tom C. Bithell
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E21 - EARTH DRILLING MINING
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Mine roof supports
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Patent number 4,784,532
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Issue date Nov 15, 1988
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Gullick Dobson Limited
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Kenneth D. Prescott
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E21 - EARTH DRILLING MINING
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Manipulable tool mount
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Patent number 4,141,594
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Issue date Feb 27, 1979
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Gullick Dobson Limited
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Reginald A. Phillips
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E21 - EARTH DRILLING MINING
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Mine roof support control
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Patent number 4,134,270
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Issue date Jan 16, 1979
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Gullick Dobson Limited
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Fred Small
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E21 - EARTH DRILLING MINING
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