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Scientific Apparatus
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.

ID: 1989-00345

MEDIUM: Ivory and other; LENGTH: 10 5/8”; QUANTITY: 1

Topics: Chemistry, Mathematics

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