open device meaning in English

开敞装置

Quick opening devices for dry pipe valves for fire protection service
防火设施用干管阀门的快速开启装置
Quick - opening device
快开装置
Standard for safety for quick opening devices for dry pipe valves for fire protection service
防火设施用干管阀快速打开装置的安全标准
Building hardware - electrically powered hold - open devices for swing doors - requirements and test methods
建筑五金.旋转门用电控器.试验方法和要求
Building hardware - electrically powered hold - open devices for swing doors - requirements and test methods
建筑五金.旋转门用电动定位装置.要求和检验方法

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