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3928222
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Patent number 3,928,222
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Issue date Dec 23, 1975
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E21 - EARTH DRILLING MINING
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3791255
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Patent number 3,791,255
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Issue date Feb 12, 1974
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F42 - AMMUNITION BLASTING
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3708319
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Patent number 3,708,319
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Issue date Jan 2, 1973
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E21 - EARTH DRILLING MINING
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3650564
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Patent number 3,650,564
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Issue date Mar 21, 1972
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F42 - AMMUNITION BLASTING
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2924279
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Patent number 2,924,279
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Issue date Feb 9, 1960
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E21 - EARTH DRILLING MINING
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2063761
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Patent number 2,063,761
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Issue date Dec 8, 1936
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E21 - EARTH DRILLING MINING