Donald S. Trevarthen

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Golden Valley, MN, US

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Patents Grantslast 30 patents

Information Patent Grant
Floor maintenance machine and method
- Patent number 4,586,208
- Issue date May 6, 1986
- Tennant Company
- Donald S. Trevarthen
- A47 - FURNITURE DOMESTIC ARTICLES OR APPLIANCES COFFEE MILLS SPICE MILLS SUCT...