DIN EN 1861:1998-07 Refrigerating systems and heat pumps - System flow diagrams and piping and instrument diagrams - Layout and symbols; German version EN 1861:1998
1998DIN EN 1861:1998-07 Refrigerating systems and heat pumps - System flow diagrams and piping and instrument diagrams - Layout and symbols; German version EN 1861:1998
1998DIN EN 1861:1998 Refrigerating systems and heat pumps - System flow diagrams and piping and instrument diagrams - Layout and symbols; German version EN 1861:1998