Citada por|
| US4006903 | 7 Jul 1975 | 8 Feb 1977 | | Electrical tick-tack-toe game | | US4030764 | 2 Jun 1976 | 21 Jun 1977 | | Bridge bidding indicator | | US4036500 | 2 Feb 1976 | 19 Jul 1977 | | Electrical game device | | US4391447 | 20 Nov 1980 | 5 Jul 1983 | | Electronic chess game | | US4545582 | 25 Feb 1983 | 8 Oct 1985 | | Translucent electronic board game with magnetic pawn | | US4616832 | 1 Mar 1985 | 14 Oct 1986 | | Electrical hidden movement game |
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