CSN EN 1332-3

CSN EN 1332-3 This document covers the ergonomic layout and usability of keypads. The keypad consists of numeric, command and function keys and alphanumeric characters. This document specifies the arrangement, the number and location of numeric, function and command keys, including placement of alphabetic characters on numeric keys. Design require-ments and recommendations are also provided.
Original English text of CSN EN Standard.
The price of the Standard included all amendments and correcturs.