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Curta Mechanical Calculator, a small, hand-cranked mechanical calculator introduced by Curt Herzstark in 1948. It can be used to perform addition, subtraction, multiplication, division, and (with more difficulty) square roots and other operations. considered the best portable calculators available until they were displaced by electronic calculators in the 1970s.
Drexler-arm --- A Drexler Arm is a robotic arm that can be used for advanced assembly of items. Equipped with a clasping mechanism that can grab ICs and components, this could be used to perform assembly of items, potentially even holding items in place while they are attached to the assembly with extrusion. The design comprises of a series of cylinders, and has a flexible materials shaft down the middle. The full design has 5 rotating joints and 1 extending segment.