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Self-moving dust suction device
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Patent number 9,462,922
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Issue date Oct 11, 2016
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Joseph Y. Ko
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A47 - FURNITURE DOMESTIC ARTICLES OR APPLIANCES COFFEE MILLS SPICE MILLS SUCT...
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Paper and optical disk shredder
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Patent number 7,513,448
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Issue date Apr 7, 2009
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Joseph Y. Ko
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B02 - CRUSHING, PULVERISING, OR DISINTEGRATING PREPARATORY TREATMENT OF GRAIN...
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Automatic hole punch
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Patent number 6,983,877
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Issue date Jan 10, 2006
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Joseph Y. Ko
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Y10 - TECHNICAL SUBJECTS COVERED BY FORMER USPC
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Pool guard alarm
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Patent number 6,727,819
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Issue date Apr 27, 2004
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Joseph Y. Ko
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G08 - SIGNALLING
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Paper shredding device
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Patent number 6,390,397
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Issue date May 21, 2002
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Joseph Y. Ko
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B02 - CRUSHING, PULVERISING, OR DISINTEGRATING PREPARATORY TREATMENT OF GRAIN...
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Paper shredding device
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Patent number 5,975,445
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Issue date Nov 2, 1999
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Joseph Y. Ko
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B02 - CRUSHING, PULVERISING, OR DISINTEGRATING PREPARATORY TREATMENT OF GRAIN...
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Door lock alarm
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Patent number 5,686,890
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Issue date Nov 11, 1997
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Joseph Y. Ko
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E05 - LOCKS KEYS WINDOW OR DOOR FITTINGS SAFES
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Pool guard alarm
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Patent number 5,473,310
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Issue date Dec 5, 1995
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Joseph Y. Ko
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G08 - SIGNALLING
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Door block alarm
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Patent number 5,469,139
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Issue date Nov 21, 1995
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Joseph Y. Ko
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E05 - LOCKS KEYS WINDOW OR DOOR FITTINGS SAFES