Model 13ZK twin Brunsviga Calculating machine (13 register)
- Made:
- 1936-1939 in Braunschweig
- maker:
- Grimme Natalis and Co
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Model 13ZK twin Brunsviga Calculating machine (13 register), by Grimme, Natalis and Company, Braunschweig, Germany, Serial No.223265, c. 1935. Consisting of a pair of 10 digit calculators coupled together.
