Michael J. Duwell

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Columbus, OH, US

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Patents Grantslast 30 patents

Information Patent Grant
Air carbon-arc cutting and gouging torch
- Patent number D282816
- Issue date Mar 4, 1986
- Arcair Company
- David B. Chaney
- D08 - Tools and hardware
Information Patent Grant
Push block for use in guiding work pieces during cutting operations
- Patent number D278790
- Issue date May 14, 1985
- Shopsmith, Inc.
- David B. Chaney
- D08 - Tools and hardware