| Number | Name | Date | Kind |
|---|---|---|---|
| 2914873 | Brennan | Dec 1959 | |
| 3077041 | Larson | Feb 1963 | |
| 4373917 | Jackson | Feb 1983 | |
| 5259763 | Wendel et al. | Nov 1993 |
| Number | Date | Country |
|---|---|---|
| 842480 | Jul 1960 | GBX |
| 2052826 | Jan 1981 | GBX |
| Entry |
|---|
| ABC School Supply Catalog, 1996 edition, pp. 115, 339, 340, 362. |