Number | Name | Date | Kind |
---|---|---|---|
3239478 | Harlan | Mar 1966 | |
3630980 | Russell | Dec 1971 | |
3658740 | Marrs et al. | Apr 1972 | |
3676386 | Brenner et al. | Jul 1972 | |
3753936 | Marrs | Aug 1973 | |
3792005 | Harlan | Feb 1974 |
Entry |
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Haws et al., Rubber World 167, (Jan. 1973), pp. 27-30, 32 & 48. |