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Retrofit zone damper
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Patent number D736367
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Issue date Aug 11, 2015
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Alan Manufacturing Inc.
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Richard Bluestone
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D23 - Environmental heating and cooling
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Expandable duct hanger
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Patent number 6,481,676
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Issue date Nov 19, 2002
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Alan Manufacturing Inc.
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Richard A. Bluestone
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H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
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Damper clip extension
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Patent number 6,035,849
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Issue date Mar 14, 2000
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Alan Manufacturing, Inc.
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Richard A. Bluestone
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F23 - COMBUSTION APPARATUS COMBUSTION PROCESSES
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Damper clip
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Patent number D409073
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Issue date May 4, 1999
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Alan Manufacturing, Inc.
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Richard A. Bluestone
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D08 - Tools and hardware
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73394289 - TRANSALARM
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Serial number 73394289
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Registration number 1284109
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Filing date Sep 29, 1982
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Alan Manufacturing Co.
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9 - Scientific, nautical, surveying, photographic, cinematographic, optical, weighing, measuring, signalling, checking (supervision), life-saving and teaching apparatus and instruments