Archives Catalog Entry
Slide rule, polyphase
Polyphase slide rule: ivory and wood in original box with original manual, "The Mannheim and Polyphase Slide Rules".
Manufacturer: Keuffel & Esser Co, New York. Patent date 6-5-1900.
MEDIUM: Ivory and other; LENGTH: 10 5/8”; QUANTITY: 1
Topics: Chemistry, Mathematics
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