Number | Name | Date | Kind |
---|---|---|---|
2683097 | Chatelain | Nov 1954 | |
2985177 | Gilson | May 1961 | |
4794661 | Durazzani | Jan 1989 | |
4868944 | Ishino et al. | Sep 1989 | |
4916768 | Broadbent | Apr 1990 | |
5191667 | Roy et al. | Mar 1993 | |
5507054 | Blauert et al. | Apr 1996 | |
5560061 | Wentzlaff et al. | Oct 1996 |
Number | Date | Country |
---|---|---|
1460953 | Apr 1969 | DEX |
2112285 | Dec 1971 | DEX |
Entry |
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Eurpoean Patent Office 326,800, Aug. 1989. |