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Locking mechanism
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Patent number 7,407,017
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Issue date Aug 5, 2008
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Rocktec Limited
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Angus Peter Robson
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B28 - WORKING CEMENT, CLAY, OR STONE
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Powered hammer device
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Patent number 7,331,405
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Issue date Feb 19, 2008
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Rocktec Limited
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Angus Peter Robson
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B28 - WORKING CEMENT, CLAY, OR STONE
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Rock crushers
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Patent number 6,783,092
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Issue date Aug 31, 2004
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Rocktec Limited
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Angus Peter Robson
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B02 - CRUSHING, PULVERISING, OR DISINTEGRATING PREPARATORY TREATMENT OF GRAIN...
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Nose block assembly
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Patent number 5,363,835
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Issue date Nov 15, 1994
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Rocktec Limited
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Angus P. Robson
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B25 - HAND TOOLS PORTABLE POWER-DRIVEN TOOLS MANIPULATORS