HP-35
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The HP-35 was Hewlett-Packard's first pocket calculator and the world's first scientific pocket calculator: a calculator with trigonometric and exponential functions. It was introduced in 1972.
HP-35 (1st version) scientific electronic pocket calculator
HP-35 mainboard
Calculator
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A calculator is typically a portable electronic device used to perform calculations, ranging from basic arithmetic to complex mathematics.
HP-35
…The HP-35 was Hewlett-Packard's first pocket calculator and the world's first scientific pocket calculator: a calculator with trigonometric and exponential functions. It was introduced in 1972. In about 1970…
An electronic pocket calculator with a seven-segment liquid-crystal display (LCD) that can perform arithmetic operations
A modern scientific calculator with a dot-matrix display
Scientific calculator displays of fractions and decimal equivalents
The interior of a Casio FX-991s calculator