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A Keuffel and Esser Thacher's Calculating Instrument with case; image credit on full record.

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Calculator; Keuffel & Esser, Thachers, Case.

A Kauffel & Esser case slide rule used by Bethlehem Steel Corp.

p4A.com note: A Keuffel and Esser Thacher's Calculating Instrument pat... [more detail available via subscription]

p4A Item E8887767
Category:  science & technology    Origin:  New York
Type:  computers & calculators    Year:  1881 - 1920

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