您要查找的是不是：

coloured filter 滤色镜; 彩色滤波器;
covered filler rod 涂药焊条条
blue colored filter 蓝滤光镜
closed filter press 密闭压滤机
mass coloured glass filter 有色玻璃滤光镜
blue colored green filter 蓝绿滤光镜
membrane covered filter media 覆膜滤料