DIN ETS 300640:1997-04

Human Factors (HF) - Assignment of alphabetic letters to digits on standard telephone keypad arrays.

STANDARD published on 1.4.1997

The information about the standard:

Designation standards: DIN ETS 300640:1997-04
Publication date standards: 1.4.1997
The number of pages: 12
Approximate weight : 36 g (0.08 lbs)
Country: German technical standard
Category: Technical standards DIN