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Signature	Maker	Instruments	Comments	Location	References
BROWN, JOHN ROGERS	USA, 1810-76, MIM SIM	Surveying Compass = X.	invented first automatic machine for graduating rules, 1850.	Providence, R.I.	Smart 1; USNM.
BROWN, JOHN ROGERS	USA, 1810-76, MIM SIM	Surveying Compass = X.	invented first automatic machine for graduating rules, 1850.	Providence, R.I.	Smart 1; USNM.

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