Coal preparation plant — Graphical symbols
NORMA vydána dne 30.11.1989
Označení normy: ISO 561:1989-ed.2.0
Datum vydání normy: 30.11.1989
Počet stran: 13
Přibližná hmotnost: 39 g (0.09 liber)
Země: Mezinárodní technická norma
Kategorie: Technické normy ISO
Description / Abstract: 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.