Објављен
The symbols have been selected in accordance with the following principles: a) the plants should be widely used; b) the symbols should be easy to draw and readily be distinguishable one from another; c) the principle and not the appearance of any particular type of machine should be represented, d) where a single symbol represents a group of items for which separate symbols are s-tandardized nationally, the ISO symbol should be readily distinguishable from any one of the national symbols.
ПОВУЧЕН
ISO 561:1974
ОБЈАВЉЕН
ISO 561:1989
90.93
Одлука о потврђивању стандарда
16. 5. 2023.
Postrojenja za pripremu uglja - Grafički simboli (identičan sa ISO 561:1989)
90.93 Одлука о потврђивању стандарда