| Number | Name | Date | Kind |
|---|---|---|---|
| 1470012 | Jones et al. | Oct 1923 | |
| 2258418 | Macey | Oct 1941 | |
| 3347565 | Konkel | Oct 1967 | |
| 4007950 | Giulie | Feb 1977 | |
| 4548426 | Lockhart | Oct 1985 | |
| 4667983 | Spolander | May 1987 | |
| 4697970 | Hanson | Oct 1987 | |
| 4702659 | Hanson | Oct 1987 | |
| 4762341 | Rabuse | Aug 1988 | |
| 4793758 | Hanson et al. | Dec 1988 | |
| 4800110 | Ducorday | Jan 1989 | |
| 4928995 | Pickering et al. | May 1990 | |
| 5025978 | Pacione | Jun 1991 | |
| 5052872 | Hunder et al. | Oct 1991 |
| Entry |
|---|
| Jacobs Gardner Office Products Catalog, p. 924 1991. |