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The HP-25 was a hand-held programmable scientific/engineering calculator made by Hewlett-Packard between early January 1975 and 1978. The HP-25 was introduced as a cheaper (US$195 MSRP) alternative to the ground-breaking HP-65. To reduce cost, the HP-25 omitted the HP-65's magnetic card reader, so it could only be programmed using the keyboard ...
Calculators supporting such programming were Turing-complete if they supported both conditional statements and indirect addressing of memory. Notable examples of Turing complete calculators were Casio FX-602P series, the HP-41 and the TI-59. Keystroke programming is still used in mid-range calculators like the HP 35s and HP-12C.
Staples's logo from 1988 to 2019. Staples Inc. is an American office supply retail company headquartered in Framingham, Massachusetts. Founded by Leo Kahn and Thomas G. Stemberg, the company opened its first store in Brighton, Massachusetts on May 1, 1986. [5]
A basic scientific calculator, using infix notation, barely programmable and with no graphing capabilities. HP-21: 1975 Scaled-down HP-25. HP-21S: 1989 An algebraic, keystroke programming calculator. HP-22S: 1988 An algebraic scientific/statistics calculator. HP-25: 1975 Smaller programmable model with programs up to 49 steps.
Prior to the development of the tape dispenser, 3M's standard clear scotch tape was sold as a roll, and had to be carefully peeled from the end and cut with scissors. To make the product more useful, the scotch tape sales manager at 3M, John Borden, designed the first tape dispenser in 1932, which had a built-in cutting mechanism and would hold the cut end of the tape until its next use.
The first machine to hold a magazine of many pre-formed staples came out in 1878. On February 18, 1879, George McGill received patent 212,316 [9] for the McGill Single-Stroke Staple Press, the first commercially successful stapler.
Made in Japan, this was also the first calculator to use an LED display, the first hand-held calculator to use a single integrated circuit (then proclaimed as a "calculator on a chip"), the Mostek MK6010, and the first electronic calculator to run off replaceable batteries. Using four AA-size cells the LE-120A measures 4.9 by 2.8 by 0.9 inches ...
The Master Library Module shown removed from its socket in the back of the calculator. Magnetic card storage folio also shown. The TI-59 and TI-58 were the first hand-held calculators to utilize removable ROM program modules. The Master Library Module ROM was included with the TI-59 and TI-58, and contains several useful pre-programmed routines ...
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