| 摘要 |
A device in which a series of instructions, such as instructions for mathematical operations are supplied in the form of visible or audible signals, and in sequence. At the end of the sequence of instructions, an answer signal is supplied so that the operator of the device can check the accuracy with which the signalled instructions have been followed. For visible signals, the instructions and answers are printed and are made sequentially visible by the sequential energization of respective lamps.
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