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Electronic pocket calculator has mode keys for selection of groups of special pipeline design and construction functions
Electronic pocket calculator has mode keys for selection of groups of special pipeline design and construction functions
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机译：电子袖珍计算器具有模式键，用于选择特殊管道设计和构造功能的组
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摘要
Electronic calculator has a keyboard (11) and a display (14). The keyboard has at least one mode key (12) for calling up a number of preprogrammed mathematical functions for carrying out complex calculations using the number keys (13) of the keyboard.
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