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Sleeve anchor for screw
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Patent number 4,978,265
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Issue date Dec 18, 1990
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Thomas E. De Wan
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F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
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3199398
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Patent number 3,199,398
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Issue date Aug 10, 1965
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F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
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1518470
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Patent number 1,518,470
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Issue date Dec 9, 1924
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E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES