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Objects in "Catalogue of Eugene Dietzgen Co.: Drawing Materials, Surveying instruments, Measuring Tapes"

Objects in "Catalogue of Eugene Dietzgen Co.: Drawing Materials, Surveying instruments, Measuring Tapes"
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Scofield-Thacher Engineer's slide rule

Scofield-Thacher Engineer's slide rule

Edson Mason Scofield
patented 1901
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