Marv,
That is very interesting, impressive and powered by a steam engine!
Thank you for sharing this video.
Paul
BTW - I have a Friden Mechanical Calculator that has been sitting in my dusty attic for more than 20 years. It used to work but that last time I turned it on was probably more than 30 years ago. The calculator requires a very good cleaning before I will attempt to run it again. Someday, I also wanted to replace the steel case cover with one made from acrylic or Lexan so we can see the all the gears turning.

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