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Dietzgen 1778a Slide Rule - Hazen-Williams Hydraulic.

Major collection: Science & Technology
Object type: slide rule
Maker: E. Dietzgen Co.
Measurements: 11 in
Nomenclature: data processing tools and equipment - slide rules
Classification: tools and equipment

Wood, ivory, wih metal and glass view finder. Dietzgen no. 1778a cat 1910