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There are some details of Bell Punch Sumlock, Plus Adder, Sumlock-Comptometer and ANITA machines that are not known to us.  Do you have this information to pass on for publication on this site?

During more than twenty years of collecting information about the machines featured on this website there are some details that have proved very elusive.  If you can help with this information then please get in touch.


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Sumlock Marks
Anita Mk12 SqRt

The Bell Punch Company & the Development of the Anita Calculator
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