2019DIN 18379:2019-09 German construction contract procedures (VOB) - Part C: General technical specifications in construction contracts (ATV) - Installation of air conditioning systems
2016DIN 18379:2016 German construction contract procedures (VOB) - Part C: General technical specifications in construction contracts (ATV) - Installation of air conditioning systems
2012DIN 18379:2012 German construction contract procedures (VOB) - Part C: General technical specifications in construction contracts (ATV) - Installation of air conditioning systems