CONCISE Circular Slide Rule w/ Case and Booklet. Promotional Twin Disc Inc.

CONCISE Circular Slide Rule w/ Case and Booklet. Promotional Twin Disc Inc. (image 1/4)
CONCISE Circular Slide Rule w/ Case and Booklet. Promotional Twin Disc Inc. (image 2/4)
CONCISE Circular Slide Rule w/ Case and Booklet. Promotional Twin Disc Inc. (image 3/4)
CONCISE Circular Slide Rule w/ Case and Booklet. Promotional Twin Disc Inc. (image 4/4)
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Promotional Concise Circular Slide Rule. Made in Japan. Sold for the Twin Disc, Inc. Systems Engineering.Free economy shipping to the lower 48 States.Concise is the only manufacturer still producing and marketing new slide rules that have the classic scales. It appears that Concise promotion slide rules were only sold to United States companies. The advantage of circular slide rules, is that the dimensions can be small enough to fit in your shirt pocket, yet have the scale resolution of a standard linear slide rule. Construction is simple as the only only fastener is the single screw or rivet at the center of the disk
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