The broken lines depict unclaimed environmental subject matter.
The broken lines depict unclaimed environmental subject matter.
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| Number | Date | Country |
|---|---|---|
| 1039429 | Sep 1958 | DE |
| 3807127 | Sep 1989 | DE |
| 0310516 | Apr 1989 | EP |
| 1356398 | Feb 1964 | FR |
| 2109213 | May 1972 | FR |
| 2186839 | Jan 1974 | FR |
| 2427107 | Dec 1979 | FR |
| 2576518 | Aug 1986 | FR |
| 2061490 | May 1981 | GB |
| 9942186 | Aug 1999 | WO |
| 0120489 | Mar 2001 | WO |