| Number | Date | Country | Kind |
|---|---|---|---|
| 2043684 | Dec 1994 | GBX |
| Number | Name | Date | Kind |
|---|---|---|---|
| D103606 | Bernard | Mar 1937 | |
| D120262 | Forstmann | Apr 1940 | |
| D207691 | Mazur | May 1967 | |
| D235694 | Hill | Jul 1975 | |
| D261819 | Ford et al. | Nov 1981 |
| Entry |
|---|
| Dot screen pattern No. 7052, Graphic Products Corporation Catalog #7, p. 130, 1981. |
| Dot screen pattern No. LT29* 10 %, 1983 Letraset Reference Manual, p. 245, 1983. |