Special Features:

Positive entries black ink, negative entries red ink, non-add key, built-in carrying handle, comma every 3 digits

Properties:

A small computerized device which performs arithmetic calculations. It may have keys which calculate algebraic, trigonometric, or other functions. It may be programmable or include alphanumeric capability (such as for telephone lists or memos). Excludes accounting machine. See also adding and subtracting machine and adding machine.