Raymond L. Weholt

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Seattle, WA, US

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Patents Grantslast 30 patents

Information Patent Grant
Insulating tunnel liner system
- Patent number 5,470,178
- Issue date Nov 28, 1995
- Raymond L. Weholt
- E21 - EARTH DRILLING MINING
Information Patent Grant
Insulated tunnel liner and rehabilitation system
- Patent number 4,940,360
- Issue date Jul 10, 1990
- Raymond L. Weholt
- E21 - EARTH DRILLING MINING