Concise ruler circular slide rule. It is a type scale for calculations related to the number of days and also used as a perpetual calendar. It is widely used for quick viewing of elapsed days, lending and borrowing, and organizing work schedules. This slide rule is also used by health centers and livestock farmers.
It can also be used as a perpetual calendar, so it is a very interesting product because it can also be used to determine what day of the week was your birth date? " And "what is the calendar for the month of the month three years later? " In addition, this back side has the same specifications as the front side of "Slide rule No. 300, so it can be used for general calculations and is very convenient.
Calculation type: General multiplication / division / proportional (exponential percentage) / square / cube, descending calculation, etc. Surface: days scale, calendar Back side: Same specifications as the front side of Slide rule NO. Scale: A, D, C, CI, B, K, L (back side) Dedicated storage case, instruction manual included(only Japanese) Size Diameter approx.105mm Main material: Vinyl chloride Made in Japan. International Buyers - Please Note. The item "Concise ruler circular slide rule 480 100836" is in sale since Tuesday, June 15, 2021. This item is in the category "Collectibles\Science & Medicine (1930-Now)\Engineering\Slide Rules". The seller is "kandyjp" and is located in Japan. This item can be shipped to United States, all countries in Europe, all countries in continental Asia, Canada.