| Number | Name | Date | Kind |
|---|---|---|---|
| 4361408 | Wirtschafter | Nov 1982 | |
| 4382688 | Machamer | May 1983 | |
| 4473884 | Behl | Sep 1984 | |
| 4504153 | Schollmeyer et al. | Mar 1985 | |
| 4682299 | McIntosh et al. | Jul 1987 | |
| 4831562 | McIntosh et al. | May 1989 | |
| 4962491 | Schaeffer | Oct 1990 | |
| 5063698 | Johnson et al. | Nov 1991 | |
| 5152422 | Springer | Oct 1992 | |
| 5181189 | Hafuer | Jan 1993 | |
| 5239491 | Mucciacciaro | Aug 1993 | |
| 5291191 | Moore | Mar 1994 | |
| 5358483 | Sibalis | Oct 1994 |
| Entry |
|---|
| Damark Product Catalog; "Electronics Direct"; pp. 16, 20-21, 25; Apr. 18, 1994 Edition; Damark International, Inc. Minneapolis MN 55429; USA, Apr. 18, 1995. |