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Tag: J.P. Knight
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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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