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| Number | Title | Issue Date |
| D566552 | Cover with closing arrangement | 04/15/2008 |
| 7244358 | Denitrification of aquarium water The invention relates to agents for the removal or reduction of inorganic nitrogen compounds, especially nitrate, from biological aquarium waters, containing a biologically degradable polymer, preferably polycaprolactone (PCL) and to the utilization of said agents. | 07/17/2007 |
