Hewlett-Packard 9100 - Computer Calculator For Math And Science (1968) - YouTube
Hewlett Packard HP Oscilloscope Measurement Error Calculator 1968 | eBay
HP - HP calculators have been making it count since 1968. #TBT http://hp.nu/KNcJ9 | Facebook
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First Electronic Calculator Prototype – Joy of Museums Virtual Tours
HP - #TBT In 1968, Bill and Dave created HP 9100A, the world's first programmable scientific calculator. Today, we follow in their footsteps with another mathematical innovation: HP Prime. http://hp.tl/6185BKgVx | Facebook