![[Hauptseite]](/upload/wiki.png)
Hauptseite
Patent
Suchergebnisse für: Addo Limited
- Patent:GB1132204 30.10.1968 Clark, Asby James Leslie (P) Addo Limited (P) : An ancillary device to extend the scope and range of application of calculators used to teach simple arithmetic
- Patent:GB979150 01.01.1965 Clark, John Arnold (P) Addo Limited (P) : An improved calculator for teaching simple arithmetic