Pocket Calculating Devices

Description

While the 20th century saw grand designs for general-purpose computers, it also saw principles of precision engineering applied to earlier designs, allowing them to become portable.

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Calculating Devices

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Specialist Slide Rules

Description:, Material: This calculator is made of ABS which is wear resistant, durable and not easy to be damaged., Portable: This calculator is

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Slide rule Facts for Kids

MINI CALCULATOR-- Made from premium material, it is reliable and durable. CALCULATOR-- Solar calculator, no need for external battery, it can be

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