| 摘要 |
An electronic calculator using a very small number of operative keys which comprises only four operative keys in all, that is, key for presetting a digit (0 to 9) of any order in a display section, the key for shifting the digit, the key for designating a specified mode from among a plurality of modes of calculating operation and the equal key for providing the result of calculating operation, wherein combination of these keys attains any desired type of function.
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