Giovanni Colliva

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104 - Sao Paulo, BR

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Patents Grantslast 30 patents

Information Patent Grant
Principles and appliances for the cutting of spherical-faceted gems...
- Patent number 5,003,791
- Issue date Apr 2, 1991
- Giovanni Colliva
- B24 - GRINDING POLISHING
Information Patent Grant
Principles and appliances for cutting of spherical-faceted gems and...
- Patent number 4,686,795
- Issue date Aug 18, 1987
- Giovanni Colliva
- B24 - GRINDING POLISHING