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2. HP-35 - Wikipedia

   en.wikipedia.org/wiki/HP-35

   The HP-35 was 5.8 inches (150 mm) long and 3.2 inches (81 mm) wide, said to have been designed to fit into one of William Hewlett's shirt pockets. Was the first scientific calculator to fly in space in 1973. [5] HP-35 calculators were carried on the Skylab 3 and Skylab 4 flights, between July 1973 and February 1974. [6]

3. Ring binder - Wikipedia

   en.wikipedia.org/wiki/Ring_binder

   There is a variant for half-letter size pages (8 + 1 ⁄ 2 by 5 + 1 ⁄ 2 inches or 220 mm × 140 mm), whose three rings are 2 + 3 ⁄ 4 inches (70 mm) apart. "Ledger" size binders hold 11-by-17-inch (28 by 43 cm) paper, and may use standard 3-ring spacing or multiple additional rings.

4. TI SR-50 - Wikipedia

   en.wikipedia.org/wiki/TI_SR-50

   SR-50 (1974) Printed circuit board. Data code 035: 3rd week 1975. The SR-50 was Texas Instruments' first scientific pocket calculator with trigonometric and logarithm functions. . It enhanced their earlier SR-10 and SR-11 calculators, introduced in 1973, which had featured scientific notation, squares, square root, and reciprocals, but had no trig or log functions, and lacked other featur

5. Texas Instruments Business Analyst - Wikipedia

   en.wikipedia.org/wiki/Texas_Instruments_Business...

   Texas Instruments BA II Plus Professional. The BA II Plus is the main financial calculator sold by Texas Instruments as of 2015. It provides basic scientific calculator functionality alongside its financial functions, and provides most of its financial functions in the form of worksheets, where values are input as variables in a table; when a computation is requested, the calculator plugs the ...

6. Comparison of HP graphing calculators - Wikipedia

   en.wikipedia.org/wiki/Comparison_of_HP_graphing...

   IrDA, 2×5-pin RS-232: 3×1.5 V (4.5 V) AAA: 2000–2003 HP 38G: hp 39g+ HP 38G (F1200A, F1892A) 4 MHz Yorke (Saturn 1LT8 core) 32 KB RAM, not flashable 4-line (131×64 pixel) monochrome LCD Algebraic: Dynamic: HP Basic: No 8-bit RPL character set [12] Buzzer HP SIR, 2×5-pin RS-232: 3×1.5 V (4.5 V) AAA: 1995 None HP 39G, HP 40G: HP-28S: 1 MHz ...

7. HP-41C - Wikipedia

   en.wikipedia.org/wiki/HP-41C

   The HP-41C series are programmable, expandable, continuous memory handheld RPN calculators made by Hewlett-Packard from 1979 to 1990. The original model, HP-41C, was the first of its kind to offer alphanumeric display capabilities.