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Vertically displaceable ramp
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Patent number 5,992,848
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Issue date Nov 30, 1999
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Williams Electronics Games, Inc.
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John Krutsch
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A63 - SPORTS GAMES AMUSEMENTS
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Ball diverter for raised ramp
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Patent number 5,358,240
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Issue date Oct 25, 1994
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Williams Electronics Games, Inc.
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Patrick Lawlor
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A63 - SPORTS GAMES AMUSEMENTS
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Pinball machine
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Patent number 4,840,375
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Issue date Jun 20, 1989
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Patrick M. Lawlor
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A63 - SPORTS GAMES AMUSEMENTS