Donald L. Thomsen

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Minneapolis, MN, US

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Patents Grantslast 30 patents

Information Patent Grant
Surface maintenance machine with rotary lip
- Patent number 4,624,026
- Issue date Nov 25, 1986
- Tennant Company
- Donald L. Olson
- E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
Information Patent Grant
Surface maintenance machine having air recirculation
- Patent number 4,310,944
- Issue date Jan 19, 1982
- Tennant Company
- Harley E. Kroll
- E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
Information Patent Grant
Surface maintenance machine having air recirculation
- Patent number 4,206,530
- Issue date Jun 10, 1980
- Tennant Company
- Harley E. Kroll
- E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES