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Expansion dowel
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Patent number 6,179,536
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Issue date Jan 30, 2001
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Hilti Aktiengesellschaft
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Thomas Belz
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F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
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Undercut self-cutting dowel
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Patent number 6,135,688
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Issue date Oct 24, 2000
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Hilti Aktiengesellschaft
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Thomas Belz
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F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
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Combination drilling member
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Patent number 6,073,710
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Issue date Jun 13, 2000
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Hilti Aktiengesellschaft
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Franz Popp
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B28 - WORKING CEMENT, CLAY, OR STONE