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when evacuating from the public place, without any light and fire extinguisher, also we doesn't know where the safe direction.
But, if there is 4- Way Rhombus, we can solve the problem. 4- Way Rhombus escape from the existing facilities, In case
of fire, fire detector sends a signal to the 4-Way Rhombus, people can evacuate go along the LED light to the safe direction.
Also inside a flashlight and a throwing fire extinguisher is placed, provide a more safe direction.
Seongnam-si, South Korea
han ol Yu,