Kalkometer – circa 1930′s Calculator

From the instructions: The Handy, New KALKOMETER A practical Pocket Adding Machine that everyone can afford!!! A Metal Stylus is included with every machine. This is to be held as shown in the illustration. The BLACK FIGURES on the right of each column are to be used for ADDITION. The GREY FIGURES on the left of each column are to be used for SUBTRACTION. Note — Clearing Bar on top of machine. To reset in all answer windows, then replace. Do this after every example. We suggest yo master each step before going on to the next example. Practice makes for speed. If operated correctly, this machine will always give you the correct answer…immediately! Housewives use this handy machine to check grocery bills, students use it to speed homework, businessmen add bills, invoices, etc. Everyone can use it at home , school or office. Makes a fine gift for birthday or Christmas. Order another one now!

Kalkometer – circa 1930′s Calculator

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