Hardy R. Hallstrom

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Turku, FI

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Patents Grantslast 30 patents

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Device for forming a collar around a hole in the wall of a pipe
- Patent number 4,299,107
- Issue date Nov 10, 1981
- G. A. Serlachius Oy
- Hardy R. Hallstrom
- B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...