Worlds 1st Scientific Calculator--HP-35 Start Price USD 400.00 Current Price USD 400.00 Time Left - Bid Count 0 Buy It Now Price - Reserve Price - Start Time Saturday, October 04, 2008 End Time Saturday, October 11, 2008 Location Hot Springs Village, AR See more about 'Worlds 1st Scientific Calculator--HP-35' Description Product InformationBrand: Hewlett-Packard Model 35 Scientific Calculator with adaptor and original, excellent condition leather casePower Source: Batteries and Adaptor The HP-35 Scientific Calculator, so called because it had 35 keys, was introduced in 1972. It was the world's first handheld scientific calculator. In one of the most amazing displacements in the history of technology, the HP-35 Scientific Calculator electronic calculator, and others like it, quickly replaced the faithful slide rule that had been used by generations of engineers and scientists for rapid calculation and simple computation.  The HP 35 was HP's first product that contained both integrated circuits and LEDs (light-emitting diodes). Place a Bid!