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Prop connecting ring
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Patent number 6,481,912
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Issue date Nov 19, 2002
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Lung Ching Shih
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F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
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2891296
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Patent number 2,891,296
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Issue date Jun 23, 1959
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E04 - BUILDING
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2365501
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Patent number 2,365,501
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Issue date Dec 19, 1944
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E04 - BUILDING
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2107407
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Patent number 2,107,407
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Issue date Feb 8, 1938
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E04 - BUILDING