| 摘要 |
The arrival of mail (3) is detected by an optical transmitter /receiver (7) and a reflecting plate (8). An electrical generator (4) supplies an electrical charge to the package and the amount of charge retained after progress along the test plate is measured (5). The higher charges are found on the plastic packages which are paper labelled for bar coding. The packages are finally discharged through brushes (9) An INDEPENDANT CLAIM is also included for: Generator, charge measuring equipment and complementary test plate used by the method
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