Number | Date | Country | Kind |
---|---|---|---|
3810471 | Mar 1988 | DEX |
Number | Name | Date | Kind |
---|---|---|---|
3864000 | Coller et al. | Feb 1975 | |
4080041 | Hawkins | Mar 1978 | |
4200347 | Sinclair et al. | Aug 1980 | |
4469387 | McHugh | Sep 1984 | |
4734042 | Martens | Mar 1988 |
Number | Date | Country |
---|---|---|
3318135 | Nov 1984 | DEX |
Entry |
---|
DIN 41-62; "German Industrial Norm", part 1 (1-1988), part 2 (10-1987). |