| Number | Name | Date | Kind |
|---|---|---|---|
| 2766494 | Stremmel | Oct 1956 | |
| 4823235 | Suzuki et al. | Apr 1989 | |
| 5068493 | Benn, Sr. et al. | Nov 1991 | |
| 5124889 | Humbert et al. | Jun 1992 |
| Number | Date | Country |
|---|---|---|
| 2352942 | Dec 1977 | FRX |
| 35812 | Nov 1969 | DDX |
| Entry |
|---|
| IBM Technical Bulletin, Lockart, vol. 20, No. 10, p. 4026, Mar. 1978. |
| IBM Technical Bulletin, Crosby, vol. 20, No. 1, p. 282, Jun. 1977. |