Erwin Frei

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Widnau, CH

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Patents Grantslast 30 patents

Information Patent Grant
Method of precise position determination
- Patent number 5,252,982
- Issue date Oct 12, 1993
- Leica Heerbrugg AG
- Erwin Frei
- G01 - MEASURING TESTING
Information Patent Grant
Surveying system including an electro-optic total station and a por...
- Patent number 5,233,357
- Issue date Aug 3, 1993
- Wild Leitz AG
- Hilmar Ingensand
- G01 - MEASURING TESTING