| Number | Name | Date | Kind |
|---|---|---|---|
| 2794454 | Moulthrop | Jun 1957 | |
| 3351106 | Moulthrop | Nov 1967 | |
| 3693836 | Eisner | Sep 1972 | |
| 4664160 | Rothstein et al. | May 1987 | |
| 5103879 | Hickerson | Apr 1992 | |
| 5199244 | Beier et al. | Apr 1993 |
| Entry |
|---|
| Photo of machine used by Assignee Oct. 1997 (far left of page). |