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Signature	Maker	Instruments	Comments	Location	References
DUBOIS, HENNON	France, c.1800,		invented a type of surveying instrument for triangulation; it was made by Charles Mercklein.		Libert et Castor 4/28/82; RSW.
DUBOIS, HENNON	France, c.1800,		invented a type of surveying instrument for triangulation; it was made by Charles Mercklein.		Libert et Castor 4/28/82; RSW.

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