Number | Name | Date | Kind |
---|---|---|---|
2488611 | Stallings | Nov 1949 | |
2836323 | Robinson | May 1958 | |
4410179 | Rubik | Oct 1983 | |
4949969 | Johnson | Aug 1990 | |
5074561 | Johnson | Dec 1991 | |
5083788 | Conotter | Jan 1992 | |
5116053 | Blankenburg et al. | May 1992 | |
5259619 | Rosewarne | Nov 1993 | |
5267732 | Bowen et al. | Dec 1993 | |
5429364 | Chang | Jul 1995 |
Number | Date | Country |
---|---|---|
1199351 | Jan 1986 | CAX |
Entry |
---|
Puzzles 1986 p. 138. |
Playthings Aug. 1981 p. 42 P.G. Co. Puzzle. |
Playthings Nov. 1981 p. 31 P.G. Co. Puzzle. |