Invention Grant US1605888A Aid to navigation between different water levels 失效 Basic information Please log in to see more content Basic information Please log in to see more content Aid to navigation between different water levels Patent Title: Aid to navigation between different water levels Application No.: US1605888D Application Date: Publication No.: US1605888A Publication Date: 1926-11-02 Main IPC: E02C1/00 IPC: E02C1/00 Information query Espacenet IPC分类: E 固定建筑物 E02 水利工程；基础；疏浚 E02C 船舶提升设备或机械 E02C1/00 船闸；竖井式船闸，即在船闸前边筑一下部带洞口的实体壁墙，船舶经过洞口通行（船闸闸门入E02B7/20)
