Number | Date | Country | Kind |
---|---|---|---|
3103583 | Feb 1981 | DEX |
Number | Name | Date | Kind |
---|---|---|---|
3081089 | Gustafson | Mar 1963 | |
3655201 | Nichols | Apr 1972 |
Number | Date | Country |
---|---|---|
170062 | Dec 1977 | HUX |
55-3956 | Jan 1980 | JPX |
Entry |
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"Notes on Rubik's Magic Cube" by David Singmaster, Published by Enslow Publishers, Hillside, NJ, copyright 1979, p. 29. |