Number | Date | Country | Kind |
---|---|---|---|
3635916 | Oct 1986 | DEX |
Number | Name | Date | Kind |
---|---|---|---|
2015430 | Matthews et al. | Sep 1935 | |
2969250 | Kull | Jan 1961 | |
3331217 | Wildhaber | Jul 1967 |
Number | Date | Country |
---|---|---|
2636382 | Oct 1980 | DEX |
1560270 | Feb 1969 | FRX |
Entry |
---|
German Standard DINs 5461 to 5465 and 5480. |