Machines from serial number 3092 and beyond had done the change to the logic to eliminate the “B” counter, making the machines “three counter” architecture machines. The Friden 132 calculators prior to serial number 3902 has utilized the original four-counter architecture which is similar to the Friden 130. In the latter part of 1965, Friden engineers realized that there is a possibility to make design changes by removing one of the four counters in the machine and simplify the logic. Except the additional features, the overall architecture and design of 132 was fundamentally similar to the 130 implementation. #Friden calculator patents manual#Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.) Expired - Lifetime Application number US478543A Inventor Clayton Billy Burke Fagen Robert Ernest Marshman. This invention relates to electronic calculators, and more particularly to an electronic calculator having keyboard access to a first-in, first-out numeric data storage which enables many common calculations to be readily performed with less manual data entry and less operator decision making than heretofore possible, thereby reducing operator errors and increasing operator speed. With those additional features the 132 calculator made more suitable for scientific applications where the square root or constant operations were frequently needed. remote calculator Prior art date Legal status (The legal status is an assumption and is not a legal conclusion. In June 1963, Friden introduced the four-function EC-130. The first all-electronic desktop calculator was the British ANITA Mk.VII, which used a Nixie tube display and 177 subminiature thyratron tubes. The main difference between 132 and 130 electronic calculators are the added features of the 132 such as single-key automatic square root function, additional fixed decimal point settings, and a modification to the Reverse Polish Notation (RPN) stack logic which made the top register in the stack automatically duplicate itself into the 3rd register when the stack popped, providing an automatic constant feature. Over time, during the 1950s and 1960s a variety of different brands of mechanical calculator appeared on the market. According to the history, Friden EC-130 is the first commercially-available, solid-state desktop electronic calculator. The Friden 132 electronic calculator can be considered as the successor of the groundbreaking, successful Friden 130.
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