| Number | Name | Date | Kind |
|---|---|---|---|
| 4811954 | Hemmann | Mar 1989 |
| Entry |
|---|
| Popular Mechanics, "Flip Over Chest Set", Dec. 1962, vol. 118, No. 6, pp. 126-129. |
| Mechanics Illustrated, "How to Make a Backgammon Board", Aug. 1973, pp. 80-81. |
| The Hecht Co. advertizement, Washington Post, Jun. 6, 1975, p. B10. |