| Number | Date | Country | Kind |
|---|---|---|---|
| 2048574 | Jul 1995 | GBX |
| Number | Name | Date | Kind |
|---|---|---|---|
| 3485966 | Bailey et al. | Dec 1969 | |
| 4211900 | Quigley | Jul 1980 | |
| 4544811 | Brevick | Oct 1985 |
| Entry |
|---|
| Switchcraft .COPYRGT.1989; Shoe Switches--Item Nos. 56313L1, 56313L2, C56313L1, & C56313L2; pp. 4-10. |