�1���� Use of digits and letters on telephone
sets
�2����
Rotary dials
�3����
Pushbuttons or keys
������� 3.1���� Ten pushbuttons
������� 3.2���� 12 pushbuttons
������� 3.3���� Dual mode and engraving
������� 3.4���� Design of symbols
������� 3.5���� Use of colours
������� 3.6���� Position of figures, letters and symbols on push-button sets
�4����
Additional pushbuttons for use on telephones
������� 4.1���� General
������� 4.2�� ��Specific
recommendations
Reference