Concise slide rules are manufactured by K.K. Konsaisu of Tokyo, Japan. They are the only manufacturer still producing and marketing new slide rules that have the classic scales. The Concise rules in particular are circular slide rules with various models both for generic numerical calculations, and for specialized calculations performed in various industries and professions. Promotional slide rules with company names are very common. Concise is the only major manufacturer that has continued to produce and sell popular versions of their circular slide rules to this day.
Total number of Concise slide rules in the collection: 4. \(~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~\)
||1955||C||pl||12||yes||very early model?; red lettering; brown case|
||1959-1966||C||pl||2||no||Radio Computer, with instruction sheet; Concise Co., Ltd.|
|600ST||1969||C||pl||8||yes||Designed by Sama & Etani; Norton promotion; Periodic Table and Temp Conversion on back; insert with conversions for Flow, Pressure, Energy, Power, Volume, Velocity, etc.; instruction pamphlet|
||1970||C||pl||8||yes||good condition; Super Takeda embossed on the black case|