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Tapered rolled thread bar joint
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Patent number 4,870,848
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Issue date Oct 3, 1989
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Erico International Corporation
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Anton M. Kies
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B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
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Method for rolling tapered threads on bars
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Patent number 4,819,469
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Issue date Apr 11, 1989
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Erico International Corporation
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Anton M. Kies
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B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
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Ground rod
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Patent number 4,577,053
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Issue date Mar 18, 1986
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Anton M. Kies
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E02 - HYDRAULIC ENGINEERING FOUNDATIONS SOIL SHIFTING
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Tapered thread cutting machine
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Patent number 4,526,496
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Issue date Jul 2, 1985
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Erico Products, Inc.
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Anton M. Kies
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B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR