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International patent classification.
- 346.048 I612174 1999
- World Intellectual Property Organization,
- 1999.
- [Geneva, Switzerland] :
-
Classification internationale des brevets.
- 346.048 I612174c 1999
- Organisation mondiale de la propriété intellectuelle,
- 1999.
- [Geneva, Switzerland] :
-
International patent classification.
- 346.048 I612174 2006
- World Intellectual Property Organization,
- 2006.
- [Geneva, Switzerland] :