Number | Name | Date | Kind |
---|---|---|---|
3248401 | Tondeur et al. | Apr 1966 | |
3658845 | Posselt et al. | Apr 1972 | |
3706747 | DeAngelis et al. | Dec 1972 | |
3880891 | Hill et al. | Apr 1975 |
Number | Date | Country |
---|---|---|
2,130,480 | Mar 1972 | DT |
2,230,669 | Dec 1972 | DT |
1,080,114 | Apr 1960 | DT |
1,079,066 | Apr 1960 | DT |
Entry |
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Charlier et al., C. A. Vol. 80:43994w. |