Kill Soon Kwak

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Ulsan, KR

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Patents Grantslast 30 patents

Information Patent Grant
Heat transfer tube with cross-grooved inner surface and manufacturi...
- Patent number 6,026,892
- Issue date Feb 22, 2000
- Poongsan Corporation
- Pyung Gon Kim
- B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...