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Luminous electronic clock
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Patent number 10,691,069
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Issue date Jun 23, 2020
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Tsuen Jer Enterprise Co., Ltd.
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Cheng-Wei Lin
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G04 - HOROLOGY
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3548992
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Patent number 3,548,992
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Issue date Dec 22, 1970
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G01 - MEASURING TESTING
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3077177
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Patent number 3,077,177
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Issue date Feb 12, 1963
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G01 - MEASURING TESTING
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3054378
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Patent number 3,054,378
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G01 - MEASURING TESTING
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2156437
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Patent number 2,156,437
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Issue date May 2, 1939
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G01 - MEASURING TESTING
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2091693
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Patent number 2,091,693
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Issue date Aug 31, 1937
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G01 - MEASURING TESTING
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1719672
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Patent number 1,719,672
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Issue date Jul 2, 1929
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G01 - MEASURING TESTING
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1707030
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Patent number 1,707,030
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G01 - MEASURING TESTING
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1424963
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Patent number 1,424,963
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Issue date Aug 8, 1922
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G01 - MEASURING TESTING
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1410490
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Patent number 1,410,490
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Issue date Mar 21, 1922
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G01 - MEASURING TESTING