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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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