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Electrical switch mat
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Patent number 6,054,658
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Issue date Apr 25, 2000
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Tapeswitch Corporation
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Edward W. Duhon
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H01 - BASIC ELECTRIC ELEMENTS
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Drape sensor
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Patent number 5,856,644
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Issue date Jan 5, 1999
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Lester E. Burgess
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E05 - LOCKS KEYS WINDOW OR DOOR FITTINGS SAFES
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Switch mat with active threshold
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Patent number 5,602,428
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Issue date Feb 11, 1997
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Acrometal Companies, Inc.
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Joseph F. Schultz
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F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
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Treadle assembly
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Patent number 4,963,705
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Issue date Oct 16, 1990
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Chomerics, Inc.
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John Broderick
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G08 - SIGNALLING
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