These Instructions Should Be Carefully Read Before Using the PRESTOLOG Profitmeter and Discount Calculator

by H. Kempenich

$25 · Offered by Bartleby's Books

Portland, OR: The author, c1935. Narrow 8vo. 4 pp. Illustrated. “This instrument computes accurately per cent of profit on selling price.” Central fold short separation at fold , but very good. Accompanied by an example of the Prestolog, a circular 13 cm slide rule card stock, possible costs printed around the outer rim, with spinning adjustable inner wheel for determining selling price based on profit percentage, discounts, etc., also very

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