| Number | Name | Date | Kind |
|---|---|---|---|
| 3284083 | Levin et al. | Nov 1966 | |
| 3573792 | Reed | Apr 1971 | |
| 3791650 | Dice | Feb 1974 |
| Entry |
|---|
| Scott, W. M., "Electronic Casino"; Radio Electronics; Mar. 1974, pp. 45, 50-52, 86. |
| Plevy, A. L.; "Electronic Dice"; Electronics World; Oct. 1968, pp, 82-84. |
| Millman, J. M. and Taub, H., Pulse Digital and Switching Waveforms; McGraw Hill, 1965, pp. 404, 437-445. |