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Robot sorter being tested by the post office at Brighton . Work speeded up three times . A new robot sorter which it is claimed can work three times as quickly as the system previously used , is being tried out at the General Post Office in Brighton as an experiment . An operator working the ne machine can deal with three thousand letters every hour . The operator sits at a key board and as she depresses one of the levers , a receptacle opens and one of the letters on a moving band drops into it . There is an appropriate opening for every letter and all the operator has to do is depress the correct key . A similar system is already in use in Rotterdam . Photo shows , a sorter using the new robot sorting machine at Brighton . 21 March 1934