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Type | Model No. | Maker | Country | Construction Material | Date | Scale Length | Area of Use |

Disk | Hexadecimal | Science Spectrum | U.S.A. | Plastic | 1969 | Dia. = 21.5 cm | Computer Programming |

**Notes: **1) Used for mathematical calculations involving hexadecimal numbers 2) Both base 16 and base 10 are supported 3) Allows actual hexadecimal calculations 4) It uses cursors similar to Gilson slide rules

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