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IBM's electronic (vacuum tube) calculators could perform multiple calulations, including division. The card-programmed calculators used fields on punched cards not to specify the actual operations to be performed on data, but which "microprogram" hard-coded onto the plugboard of the IBM 604 or 605 calculator machine; a set of cards produced ...
The IBM 604 Electronic Calculating Punch was the world's first mass-produced electronic calculator along with its predecessor the IBM 603. [1] It was an electronic unit record machine that could perform multiple calculations, including division.
The IBM 602 Calculating Punch, introduced in 1946, was an electromechanical calculator capable of addition, subtraction, multiplication, and division. The 602 was IBM 's first machine that did division.
To accommodate multiple users economically, time-consuming manual data entry could be performed offline, by use of several separate key-to-punch paper tape machines (called "add-punch" machines), whose numeric-only keyboards were slightly-modified versions of mechanical desk calculators.
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Having multiple IRAs can be justified by several investment strategies. If you have a traditional IRA, funded by pre-tax dollars, and a Roth IRA, funded by after-tax dollars, you may have a ...