| Number | Date | Country | Kind |
|---|---|---|---|
| 9500155 | Jan 1995 | NL |
| Number | Name | Date | Kind |
|---|---|---|---|
| 3945870 | Johnsen | Mar 1976 | |
| 4533160 | Malone | Aug 1985 | |
| 4590109 | Holmberg | May 1986 | |
| 5328409 | Marquardt | Jul 1994 |
| Number | Date | Country |
|---|---|---|
| 2435049 | Feb 1975 | DE |
| 325057 | Jul 1989 | EP |
| 486127 | May 1992 | EP |
| Entry |
|---|
| Drakes Office System Ltd. 1991 publicly used record book. |