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Using the most commen knob to be the emergency device.Like normal Knobs,E-Door Knob can be installed on your cylindrical lock.You can open the door easily.When the fire broke out,you can take down the handgrip of E-Door Knob.It can be the occasional,movable balustrade.
Tunghai University
Taichung, Taiwan
Tunghai University
Taichung, Taiwan
Yi-Ying Lee