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![]() The Friden Calculating Machine Company began manufacturing mechanical calculating machines in California in the 1930s. ![]() A mark on the bottom at the front reads: MODEL 1. A mark on the front next to the display reads: 130 ELECTRONIC CALCULATOR. Tags on the front and on the back of the machine read: Friden. The bottom line of the display shows the answers, and numeric entries as they are entered. If the numbers are smaller, the digits to the left are zeroes. Behind the keyboard is a cathode ray tube display that shows four rows of numbers. This way of representing arithmetic operations is known as reverse Polish notation, and would be used on several electronic calculators. In entering arithmetic operations into the calculator, one first keys in a number, then pushes the enter key, then keys in the second number, and then pushes the key for the operator (e.g. A decimal point selector dial is on the right. In addition to keys for the four arithmetic operations, it has change sign, enter, repeat, clear entry, clear all, store, recall, and overflow lock keys. The hefty instrument has an array of nine square plastic digit keys, with a zero bar and a decimal point bar below these. Description This is one of the first fully transistorized electronic calculators. Eliot Elisofon Photographic Archives, African Art.
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