Stephen J. Erwin

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North Grafton, MA, US

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Patents Grantslast 30 patents

Information Patent Grant
Forming and heat treating process
- Patent number 4,048,836
- Issue date Sep 20, 1977
- Wyman-Gordon Company
- Robert A. Eddy
- B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...