Number | Date | Country | Kind |
---|---|---|---|
3328661 | Aug 1983 | DEX |
Number | Name | Date | Kind |
---|---|---|---|
4257995 | McLaughlin et al. | Mar 1981 | |
4331778 | Sommerfeld et al. | May 1982 |
Entry |
---|
Kunststoff-Handbuch, vol. III, by Vieweg-Hochtlen, Carl-Hanser Verlang, Munich, 1966, pp. 96-102. |