| Number | Name | Date | Kind |
|---|---|---|---|
| 4265557 | Runge | May 1981 | |
| 4297044 | Hornberg et al. | Oct 1981 | |
| 4687200 | Shirai | Aug 1987 |
| Number | Date | Country |
|---|---|---|
| 1158381 | May 1985 | SUX |
| Entry |
|---|
| "Spreadable Pattern Impact Tester", R. L. Bellamy, IBM Technical Disclosure Bulletin, vol. 25, No. 7A, Dec. 1982. |