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Adjustable staircase
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Patent number 9,091,083
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Issue date Jul 28, 2015
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Ottawa Hospital Research Institute
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Louis Goudreau
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E04 - BUILDING
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1128212
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Patent number 1,128,212
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Issue date Feb 9, 1915
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B60 - VEHICLES IN GENERAL
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943672
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Patent number 943,672
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Issue date Dec 21, 1909
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E04 - BUILDING
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936681
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Patent number 936,681
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Issue date Oct 12, 1909
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E04 - BUILDING