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Flap-type portal reader
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Patent number 5,221,831
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Issue date Jun 22, 1993
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Indala Corporation
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Theodore D. Geiszler
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B65 - CONVEYING PACKING STORING HANDLING THIN OR FILAMENTARY MATERIAL
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Proximity detecting apparatus
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Patent number 5,099,227
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Issue date Mar 24, 1992
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Indala Corporation
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Theodore D. Geiszler
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G06 - COMPUTING CALCULATING COUNTING
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Identification system
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Patent number 4,818,855
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Issue date Apr 4, 1989
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Indala Corporation
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Ronald W. Mongeon
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G06 - COMPUTING CALCULATING COUNTING
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Motion detection system
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Patent number 3,956,743
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Issue date May 11, 1976
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Geiszler; Theodore D.
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Theodore D. Geiszler
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G08 - SIGNALLING