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Signature	Maker	Instruments	Comments	Location	References
THACHER, EDWIN	USA, c.1881,		invented and patented a cylindrical slide rule, 1881.	Pittsburgh, Pa.	G.L'E. Turner 24.
THACHER, EDWIN	USA, c.1881,		invented and patented a cylindrical slide rule, 1881.	Pittsburgh, Pa.	G.L'E. Turner 24.

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