Film by several friction drive roller - led, you typically have 3 roll and 5 roller structure.

胶片由几个摩擦传不静辊不静员, 凡是有3辊和5辊布局.

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FZK series fire door intelligent control and MY remote control units for motor drive roller doors.

FZK系列智能型防火卷帘控制器、MY系列电动门遥控器等电子产品.

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