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Escalator step cleaner
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Patent number 8,337,625
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Issue date Dec 25, 2012
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Renaelc, LLC
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Patrick C. Gehm
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B66 - HOISTING LIFTING HAULING
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Escalator cleaning device
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Patent number 5,025,527
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Issue date Jun 25, 1991
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Advanced Escalator and Travelator Cleaner Pty. Ltd.
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Graham A. W. Armstrong
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B66 - HOISTING LIFTING HAULING
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3869749
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Patent number 3,869,749
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Issue date Mar 11, 1975
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B66 - HOISTING LIFTING HAULING
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3678533
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Patent number 3,678,533
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Issue date Jul 25, 1972
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B66 - HOISTING LIFTING HAULING
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3584329
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Patent number 3,584,329
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Issue date Jun 15, 1971
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B66 - HOISTING LIFTING HAULING
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2634850
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Patent number 2,634,850
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Issue date Apr 14, 1953
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B66 - HOISTING LIFTING HAULING
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2617515
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Patent number 2,617,515
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Issue date Nov 11, 1952
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B66 - HOISTING LIFTING HAULING
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2071819
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Patent number 2,071,819
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Issue date Feb 23, 1937
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B66 - HOISTING LIFTING HAULING
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2060491
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Patent number 2,060,491
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Issue date Nov 10, 1936
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B66 - HOISTING LIFTING HAULING
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1788364
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Patent number 1,788,364
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Issue date Jan 6, 1931
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B66 - HOISTING LIFTING HAULING