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HP-18C business consultant, 1986

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Click to go to larger photo of the Hewlett-Packard-18C business consultant.
The HP-18C was the first in a series of "clamshell" calculators produced by HP.

An advanced business model, the HP-18C calculator had a "clamshell" design, opening like a book with two keyboards facing each other inside. It included graphing and a date-time-alarm feature similar to a personal organizer. The 18C had 2K of memory and was priced at $175.

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