Patrick E. Haggerty
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Patrick Eugene Haggerty was an American engineer and businessman. He was a co-founder and former president and chairman of Texas Instruments, Incorporated. Under his leadership, the company grew from
Calculator
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A calculator is typically a portable electronic device used to perform calculations, ranging from basic arithmetic to complex mathematics.
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