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Heinz Lehnert
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Troisdorf, DE
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last 30 patents
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Method and device for producing press-rolled pipes with inner wall...
Patent number
6,038,901
Issue date
Mar 21, 2000
Dynamit Nobel Gmbh Explosivstoff-und Systemstechnik
Bernd Stein
B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...