发明授权
US3160573A Machine for removal and mounting of covers of the coke oven loading manholes and forsubsequent removal of coal charge around these manholes 失效
用于清除和安装焦炉加载人孔盖的机器,随后在这些检修孔周围清除煤气

Machine for removal and mounting of covers of the coke oven loading manholes and forsubsequent removal of coal charge around these manholes
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