Page "Calculator" Paragraph 85
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Wikipedia
The HP 12c financial calculator is still produced.
It was introduced in 1981 and is still being made with few changes.
The HP 12c featured the reverse Polish notation mode of data entry.
In 2003 several new models were released, including an improved version of the HP 12c, the " HP 12c platinum edition " which added more memory, more built-in functions, and the addition of the algebraic mode of data entry.
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