Number | Date | Country | Kind |
---|---|---|---|
3718781 | Jun 1987 | DEX |
Number | Name | Date | Kind |
---|---|---|---|
522982 | Gordon | Jul 1894 | |
563145 | Duffield et al. | Jun 1896 | |
4147308 | Mikkelsen | Apr 1979 |
Number | Date | Country |
---|---|---|
68681 | May 1983 | EPX |
430377 | Oct 1911 | FRX |
Entry |
---|
Cement Data Book, vol. 1, 1985, pp. 228-243. |