* Key-Systems GbR was turned into a limited liability company Key-Systems GmbH (Gesellschaft mit beschränkter Haftung) in 2000. <ref>[http://www.key-systems.net/company/history.php Key-Systems.net]</ref> | * Key-Systems GbR was turned into a limited liability company Key-Systems GmbH (Gesellschaft mit beschränkter Haftung) in 2000. <ref>[http://www.key-systems.net/company/history.php Key-Systems.net]</ref> |