Number | Name | Date | Kind |
---|---|---|---|
3909464 | Anorga et al. | Sep 1975 | |
4018724 | Cobbledick | Apr 1977 |
Entry |
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Modern Plastics Encyclopedia, McGraw-Hill, N.Y., 1975-1976, pp. 200, 203 & 665. |
Modern Plastics Encyclopedia, McGraw-Hill, N.Y., 1979-1980, pp. 666-667. |