The portions shown in phantom lines in
The portions shown in phantom lines in
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| Number | Date | Country |
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| 211202 | Nov 1940 | CH |
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| 4223195 | Jan 1994 | DE |
| 161057 | Nov 1985 | EP |
| 354352 | Feb 1990 | EP |
| 707836 | Apr 1996 | EP |
| 454604 | Jul 1913 | FR |
| 589016 | Jun 1947 | GB |
| 1276031 | Jun 1972 | GB |
| 8706452 | Nov 1987 | WO |