Interview with Dave Cochran about the HP 35 Calculator
Hewlett Packard calculator collection.
hp-35 vintage calculator tour
Hewlett-Packard introduces its HP-35. The 35 number in a name meant 35 keys. The machine was capable of calculating logarithmic and trigonometric functions. At the time, slide rules were the only practical portable devices for performing trigonometric and exponential functions. At the time Pocket calculators could only perform basic mathematical operations.
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