Notes: "The Kolesch Triplex slide rule has the following scales, A, D | CI, C |D, K, with S, L, and T on the back of the slide. Two D scales and no B scale. This odd scale arrangement is to simplify and speed up chain multiplications, such as A x B x C, similar to the Dietzgen Phillips slide rule. The Kolesch catalog page describing this slide rule, from their 11th edition catalog (1917), is included in the pictures. Kolesch was a company similar to Post, Dietzgen, J. H. Weil, and to some extent K&E, in that they sold mostly (possibly entirely) engineering supplies manufactured by other companies. This slide rule was made for Kolesch by Nestler, in Germany."