DIN EN 60073 VDE 0199:2003-05

Basic and safety principles for man-machine interface, marking and identification

Coding principles for indicators and actuators

DIN EN 60073 VDE 0199:1997-09

Basic and safety principles for man-machine interface, marking and identification

Coding principles for indication devices and actuators

DIN EN 60073 VDE 0199:1994-01

"""Coding of indicating devices and actuators by colours and supplementary means (IEC73:1991); German version EN60073:1993"""