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Signature	Maker	Instruments	Comments	Location	References
CRICHTON BROS.	England, fl.1820?-1872, MIM NIM PHIM	Rule, ivory = Soth. 10/17/60; Octant = Christie-SK 4/17/86; Sextant = Phillips 11/16/76; Sympiesometer = Christie 12/8/76; Rule with Protractor = D.; Stick Barometer, 1872 = D.(1976).	most instruments may be very late.	11 Billiter Street, London.	Taylor 2(2108); Moskowitz 122; RSW.
CRICHTON BROS.	England, fl.1820?-1872, MIM NIM PHIM	Rule, ivory = Soth. 10/17/60; Octant = Christie-SK 4/17/86; Sextant = Phillips 11/16/76; Sympiesometer = Christie 12/8/76; Rule with Protractor = D.; Stick Barometer, 1872 = D.(1976).	most instruments may be very late.	11 Billiter Street, London.	Taylor 2(2108); Moskowitz 122; RSW.

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