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Patent:GB1132204


Patent:GB 1132204
Title:An ancillary device to extend the scope and range of application of calculators used to teach simple arithmetic
Date:30.10.1968
Place:London
Country:Great Britain
Person:Clark, Asby James Leslie (P)
Company:Addo Limited (P)
Internal Links:Addo primary calculator, Lehrmittel
Keywords:
Link to the patent office:
(without guarantee)
 GB1132204


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Siehe auch Patent:GB979150