spherical shutter WESTBANK 球面快门

slotted shutter WESTBANK 缝隙快门

sliding shutter WESTBANK 扯百叶窗

shutter door WESTBANK 百叶门

shutter rotating disc WESTBANK 转盘快门

shutter dam WESTBANK 插坝

shutter bar WESTBANK 百页闩

shutter weir WESTBANK 楣堰

shutter butt WESTBANK 百叶窗较链