For quotients numbers automatically. As electronic appliances, both with paper strips. Or monitor either. Monitor or have both And the paper on the same machine .
Used for subtraction multiplication Division are electronic appliances, either with thaepkradat or with either a monitor or a monitor, and thaepkradat in the same instruments .
For the arithmetic numbers automatically to the use of either an electronic or a paper with the monitor one or both screens and the cardboard in the same