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Door security system
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Patent number RE35268
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Issue date Jun 11, 1996
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Harrow Products, Inc.
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George Frolov
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340 - Communications: electrical
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Door security system
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Patent number 5,065,136
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Issue date Nov 12, 1991
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Harrow Products, Inc.
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George Frolov
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E05 - LOCKS KEYS WINDOW OR DOOR FITTINGS SAFES
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Code reader
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Patent number 4,902,882
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Issue date Feb 20, 1990
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Emhart Industries, Inc.
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Gary E. Lavelle
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G06 - COMPUTING CALCULATING COUNTING
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Electronic locking system
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Patent number 4,785,425
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Issue date Nov 15, 1988
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Emhart Industries, Inc.
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Gary E. Lavelle
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G11 - INFORMATION STORAGE
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