NICE EARLY UNIS PROMOTIONAL POCKET SLIDE RULE - HARDINGE CO.

5 1/2" in total length with imperial gradations up to 5". Made in Paris by UNIS FRANCE. Likely french ivory/celluloid. Fully intact with the clear slide and in excellent condition noting that it is warped lengthwise but still perfectly functional. Great, unusual American advertising piece with a French origin.

                                    HARDINGE COMPANY, Inc., YORK, PENNA'

BALL & ROD MILLS, DRYERS, THICKENERS, CLARIFIERS."