STRUCTURE OF FLASH BOARDS AND STRUCTURE OF WATER SEALED TANK

摘要

PROBLEM TO BE SOLVED: To economically cut off a waterway in accordance with the size and shape of a hermetically sealed space variously required in the waterway. SOLUTION: In a structure of a flash board to cut off a water way, the flash board is horizontally divided into a plurality of boards and adjacent boards 1 are connected to be mutually rotatable.