Geraldo Afonso Spinelli Martins Ribeiro

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Rio de Janeiro, BR

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Patents Grantslast 30 patents

Information Patent Grant
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- Patent number 6,036,749
- Issue date Mar 14, 2000
- Petroleo Brasileiro S.A. - Petrobras
- Geraldo Afonso Spinelli Martins Ribeiro
- E21 - EARTH DRILLING MINING