| Number | Name | Date | Kind |
|---|---|---|---|
| 2686231 | Stevens | Aug 1954 | A |
| 2954442 | Mickenberg | Sep 1960 | A |
| 3031539 | Schuster et al. | Apr 1962 | A |
| 3119904 | Anson | Jan 1964 | A |
| D211951 | Thomson et al. | Aug 1968 | S |
| 4039765 | Tichy et al. | Aug 1977 | A |
| D286632 | Teunis | Nov 1986 | S |
| 4875233 | Derhaag et al. | Oct 1989 | A |
| 5369857 | Sacherman et al. | Dec 1994 | A |
| 5457751 | Such | Oct 1995 | A |
| D365559 | Fathi | Dec 1995 | S |
| 5504812 | Vangarde | Apr 1996 | A |
| 5721775 | Leifer | Feb 1998 | A |
| 5740263 | Liao | Apr 1998 | A |
| D394058 | Fitzgerald | May 1998 | S |
| D394436 | Hall et al. | May 1998 | S |
| 5793865 | Leifer | Aug 1998 | A |
| 5793878 | Chang | Aug 1998 | A |
| D405786 | Leifer | Feb 1999 | S |
| D410921 | Luchs et al. | Jun 1999 | S |
| 6016347 | Magnasco et al. | Jan 2000 | A |
| 6178251 | Luchs et al. | Jan 2001 | B1 |
| Entry |
|---|
| HELLO-Direct (Catalog of Telephone Products), Jul. 1993. |