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The Comptometer was the first commercially successful key-driven mechanical calculator, patented in the United States by Dorr Felt in 1887.. A key-driven calculator is extremely fast because each key adds or subtracts its value to the accumulator as soon as it is pressed and a skilled operator can enter all of the digits of a number simultaneously, using as many fingers as required, making ...
There are 105 sites on the National Register of Historic Places listings in South Side Chicago — of more than 350 total listings within the City of Chicago, in Cook County, Illinois. The South Side district is defined for this article as the area west of Lake Michigan , and south of 26th Street and the Chicago Sanitary and Ship Canal , to the ...
Each bead represents one unit (e.g. 74 can be represented by shifting all beads on 7 wires and 4 beads on the 8th wire, so numbers up to 100 may be represented). In the bead frame shown, the gap between the 5th and 6th wire, corresponding to the color change between the 5th and the 6th bead on each wire, suggests the latter use.
V12 - The V12 is a 12.8 oz. non-printing financial calculator with an angled LCD display used to calculate loans, payments, interest, rates, standard deviation, TVM, NPV, IRR, cash flows, bonds, etc. It has over 125 programmable options and uses 2 AAA batteries for power. It is a clone of the HP-12C Platinum edition claiming to have the same ...
The bead is made of hare bone, providing experts with the first solid evidence that people in the Clovis era, a prehistoric era in North America, used bones from the rabbit cousin for personal ...
The first sites in Chicago to be listed were four listed on October 15, 1966, when the National Register was created by the National Park Service: the settlement house Hull House, the Frank Lloyd Wright-designed Frederick C. Robie House, the Lorado Taft Midway Studios, and the site of First Self-Sustaining Nuclear Reaction. The NPS first ...
The Victor 3900 is the first electronic calculator to have been built entirely of integrated circuits (ICs). [1] [2] For its era, the 3900 is extremely advanced; it has a 4-inch (100 mm) cathode ray tube screen to produce a 5-line display, has separate memory for storing three intermediate results, supports numerical rounding, and is still "smaller than a typewriter".
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