- Wireless education system(1999)


- Wireless education system(2001)
- Wireless microphone system (2003)


- Wireless education system(2004)


- Trademark Registration(2007)


- Non-dispersion Infrared Ray with
Sub Reflection Mirror(2007)

- Non-dispersion Infrared Ray with
Oval Type Reflection Mirror(2007)
- Combination Structure of Optical
Gas Sensor(2007)
- Optical Gas Sensor with Tool of
Gathering Ray(2007)

 


 
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