TREA

Rolf Bergstrom

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  • Ramnas, SE
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Patents Grantslast 30 patents

  • Information Patent Grant

    Method of bending a link blank into a chain link and a bending mach...
    • Patent number 4,209,978
    • Issue date Jul 1, 1980
    • Bulten-Kanthal AB
    • Sigge Johansson
    • B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
  • Information Patent Grant

    Link stud inserter
    • Patent number 4,185,454
    • Issue date Jan 29, 1980
    • Bulten-Kanthal AB
    • Rolf Bergstrom
    • B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
  • Information Patent Grant

    Revolving chain links
    • Patent number 4,158,288
    • Issue date Jun 19, 1979
    • Bulten-Kanthal AB
    • Rolf Bergstrom
    • B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...