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2. HP-35 - Wikipedia

   en.wikipedia.org/wiki/HP-35

   In about 1970 HP co-founder Bill Hewlett challenged his co-workers to create a "shirt-pocket sized HP-9100".At the time, slide rules were the only practical portable devices for performing trigonometric and exponential functions, as existing pocket calculators could only perform addition, subtraction, multiplication, and division.

3. Calculator - Wikipedia

   en.wikipedia.org/wiki/Calculator

   By 1970, a calculator could be made using just a few chips of low power consumption, allowing portable models powered from rechargeable batteries. The first handheld calculator was a 1967 prototype called Cal Tech, whose development was led by Jack Kilby at Texas Instruments in a research project to produce a portable calculator. It could add ...

4. Curta - Wikipedia

   en.wikipedia.org/wiki/Curta

   Curtas were considered the best portable calculators available until they were displaced by electronic calculators in the 1970s. [1] The Curta, however, lives on, being a highly popular collectible, with thousands of machines working just as smoothly as they did at the time of their manufacture. [1] [6] [7]

5. Calculator added up to fun for a math phobic kid in the 1970s ...

   www.aol.com/calculator-added-fun-math-phobic...

   The Texas Instruments TI-30 retailed for $24.95 (about $130 today) and operated on a 9-volt battery. It had a red, eight-digit display and offered such functions as percents, constants, roots ...

6. HP 35s - Wikipedia

   en.wikipedia.org/wiki/HP_35s

   The HP 35s (F2215A) is a Hewlett-Packard non-graphing programmable scientific calculator. Although it is a successor to the HP 33s, it was introduced to commemorate the 35th anniversary of the HP-35, Hewlett-Packard's first pocket calculator (and the world's first pocket scientific calculator). HP also released a limited production anniversary ...

7. Sharp EL-8 - Wikipedia

   en.wikipedia.org/wiki/Sharp_EL-8

   The Sharp EL-8, also known as the ELSI-8, [1] was one of the earliest mass-produced hand-held electronic calculators [1] and the first hand-held calculator to be made by Sharp. Introduced around the start of 1971, [ note 1 ] it was based on Sharp's preceding QT-8D and QT-8B compact desktop calculators and used the same logic circuits, but it ...