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Signature	Maker	Instruments	Comments	Location	References
HAWTHORN, ROBERT	England, c.1832,		civil engineer; devised a hinged, engineering slide rule in 1832, made by G.T. Brumell.	Newcastle-on-Tyne.	Delehar 9.
HAWTHORN, ROBERT	England, c.1832,		civil engineer; devised a hinged, engineering slide rule in 1832, made by G.T. Brumell.	Newcastle-on-Tyne.	Delehar 9.

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