在19世纪中叶，由于工业化的发展，德国和其他欧洲国家经历了前所未有的大量因工死亡和因工事故。
During the middle of the 19th century, Germany, along with other European nations, experienced an unprecedented rash of workplace deaths and accidents as a result of growing industrialization.
燃气装配工安装，检查，维修和保养住宅，商业和工业机构的天然气管道和燃气设备，如仪表，稳压器和供热单位。
Gas fitters install, inspect, repair and maintain gas lines and gas equipment such as meters, regulators and heating units in residential, commercial and industrial establishments.
管道工安装，维修和保养管道，装置和用于住宅，商业和工业建筑的配水和废水处理等水暖器材。
Plumbers install, repair and maintain pipes, fixtures and other plumbing equipment used for water distribution and waste water disposal in residential, commercial and industrial buildings.
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