hold-open device meaning in English

枪栓固定卡榫

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
En 1155 building hardware . electrically powered hold - open devices for swing doors . requirements and test methods
建筑五金.双开弹簧门用电力开门装置.要求和试验方法
Building hardware - electrically powered hold - open devices for swing doors - requirements and test methods includes amendment a1 : 2002 ; german version en 1155 : 1997 a1 : 2002
建筑物五金件.旋转门电动定位装置.要求和试验方法