Fifteen Slide Rules, including Eugene Dietzgen Co. Maniphase rule in box; Keuffel & Esser Co. Manheim, Favorite, Student's and Polyphase Duplex rules in boxes; A.W. Faber in box; Frederick Post Co. No. 1460 Versalog, in case; and others.
Fifteen Slide Rules, including Eugene Dietzgen Co. Maniphase rule in box; Keuffel & Esser Co. Manheim, Favorite, Student's and Polyphase Duplex rules in boxes; A.W. Faber in box; Frederick Post Co. No. 1460 Versalog, in case; and others.
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