This calculator was used by my Father in Law he was an electrical engineer for the CEGB and died at the age of 72 in 1976 my Husband was also an electrical engineer and treasured his fathers calculator and on occasions used it for work at his headquaters at Bankside Power station until he retired in 1995 he died in 2003. I have taken my children to the science museum to see the Babbage early similar huge machine.
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