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Pocket Calculators/Adding Machines

Only a deprived scholar would have been without a pocket adding machine in the 1940s or 1950s. It gave one a certain advantage over the rest of the class. (Note. This doubtful advantage will of course be disputed by those educationalist types who say that we should ban electronic calculators in today's classes.) However; most maths teachers frowned upon their use and dished out a sharp clip around the ear if students were caught using them out of sight under the desk. Persistent use could result in six of the best. Those were the days!

         
   
K1 K2 K3 K4    
           
 
The British Calculator Model B For £-s-d
K5