2002EN 60073:2002 Basic and Safety Principles for Man-Machine Interface, Marking and Identification - Coding Principles for Indication Devices and Actuators
1996EN 60073:1996 Basic and Safety Principles for Man-Machine Interface@ Marking and Identification Coding Principles for Indication Devices and Actuators
1993EN 60073:1993 Coding of Indicating Devices and Actuators by Colours and Supplementary Means