Martha Winkelman

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Surfside, FL, US

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Patents Grantslast 30 patents

Information Patent Grant
In a trading game a "game average" device
- Patent number 5,102,143
- Issue date Apr 7, 1992
- Martha Winkelman
- A63 - SPORTS GAMES AMUSEMENTS
Information Patent Grant
Trading game and method for continuing playing
- Patent number 4,913,446
- Issue date Apr 3, 1990
- Martha Winkelman
- A63 - SPORTS GAMES AMUSEMENTS