| Number | Name | Date | Kind |
|---|---|---|---|
| 4464583 | Holmgren | Aug 1984 | |
| 4723822 | Merdic | Feb 1988 |
| Number | Date | Country |
|---|---|---|
| 745790 | May 1933 | FRX |
| Entry |
|---|
| Telephony, Dec. '86, p. 16, Electric Cables 1, 2, and 3, middle left, middle right side of page, respectively. |
| Radio Shack 1987 cat., p. 68, Male-to-Male Extension Cable 11, middle of page. |