This Standard defines self supporting energized devices for the height adjustment (e. g. gas spring or mechanical spring) of swivel chairs and armchairs.
DIN 4550:2004 history
2004DIN 4550:2004 Office furniture - Self-supporting energized devices for the height adjustment of office work chairs - Safety requirements, testing
1970DIN 4550:1992 Office furniture - Self-supporting energized devices for the height adjustment of office work chairs - Safety requirements, testing