| Number | Name | Date | Kind |
|---|---|---|---|
| D212242 | Paulos | Sep 1968 | |
| 610577 | Baldwin | Sep 1898 | |
| 1439336 | Smith | Dec 1922 | |
| 1856650 | McLintock et al. | May 1932 | |
| 2987318 | Hammer | Jun 1961 | |
| 3235263 | Smith | Feb 1966 | |
| 3608906 | Odier | Sep 1971 | |
| 3726027 | Cohen et al. | Apr 1973 | |
| 3865382 | Myller | Feb 1975 |
| Number | Date | Country |
|---|---|---|
| 1,108,410 | Aug 1955 | FR |
| 1,242,975 | Aug 1971 | UK |
| Entry |
|---|
| Oz Jig Saw Cubes Advertisement, Oz Puzzle Co., Watertown, Conn., 1 page, copyright 1975. |
| Alphabet Cube Advertisement, Parade Magazine, Nov. 12, 1972, p. G6. |