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Cold headed center vacuum drill bit
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Patent number 5,452,628
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Issue date Sep 26, 1995
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Kennametal Inc.
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Robert H. Montgomery
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B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
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Cold headed center vacuum drill bit
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Patent number 5,297,643
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Issue date Mar 29, 1994
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Kennametal Inc.
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Robert H. Montgomery
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B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
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Radial cut drill bit insert
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Patent number 5,184,689
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Issue date Feb 9, 1993
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Kennametal Inc.
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Daniel C. Sheirer
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E21 - EARTH DRILLING MINING
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Rotary drill bit insert
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Patent number 5,172,775
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Issue date Dec 22, 1992
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Kennametal Inc.
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Daniel C. Sheirer
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E21 - EARTH DRILLING MINING
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