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Tag: Charles Hutton Gregory

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Things Pathfinder-tagged with 'Charles Hutton Gregory'

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		December 10, 1868 – The First Traffic Signal from "On This Day" In Engineering History posted in General Discussion Pathfinder Tags: Charles Hutton Gregory December 10 Garrett Augustus Morgan J.P. Knight John Peake Knight	Created on 12/10/2009 3:54 PM by Steve Melito

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