发明授权 US135137A Improvement in couplings for steam heating apparatus for railroad cars 失效 基本信息 请登陆查看更多内容 基本信息 请登陆查看更多内容 Improvement in couplings for steam heating apparatus for railroad cars 专利标题: Improvement in couplings for steam heating apparatus for railroad cars 申请号: US135137D 申请日: 公开(公告)号: US135137A 公开(公告)日: 1873-01-21 信息查询 Espacenet