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Fastening element
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Patent number 5,404,707
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Issue date Apr 11, 1995
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Masakatsu Suzuki
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B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
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3811269
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Patent number 3,811,269
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Issue date May 21, 1974
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B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
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3611708
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Patent number 3,611,708
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Issue date Oct 12, 1971
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B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
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3611509
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Patent number 3,611,509
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Issue date Oct 12, 1971
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B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...