Building with a 3D printer in 1930

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    2 years ago

    Ancient Chines navigation system third century dC. The sculpture always pointed in the previously set direction, regardless of which direction the car was moving.

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    Car navigator 1921 (autoscrolling map hooked up by speedometer

    Also a wrist map in 1927

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    2 years ago

    Service of Video calls in a German Post office 1936

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      2 years ago

      I’ve been thinking about it, but I think it would be too much flood, due to so many inventions, to make each one separately. I think it is better to stay together in a thread. This also gives freedom that everyone can add own discoveries of inventions of this type.