Number | Name | Date | Kind |
---|---|---|---|
2633662 | Nelson | Apr 1953 | |
2984935 | Beck | May 1961 | |
3564758 | Willis | Feb 1971 | |
3698124 | Reitzel et al. | Oct 1972 | |
3940100 | Haug | Feb 1976 | |
4789370 | Ellefson | Dec 1988 | |
5163862 | Philips et al. | Nov 1992 | |
5628666 | Tomczyk et al. | May 1997 | |
5672087 | De La Paz Rizo et al. | Sep 1997 | |
5833512 | Nicola | Oct 1998 |
Number | Date | Country |
---|---|---|
2054393 | Feb 1981 | GBX |
Entry |
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Playplax Squares--advertisement, Mar. 1968. |