• ETSI ETS 300 640
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ETSI ETS 300 640

  • Human Factors (HF); Assignment of alphabetic letters to digits on standard telephone keypad arrays
  • standard by European Telecommunications Standards Institute, 08/01/1996
  • Publisher: ETSI

$7.00$14.00


To endorse the global standardization (dated) in ITU-T and ISO to give guidance to telephone terminal manufacturers.

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