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Make a foursquare trough on the keystoke. The concave trough consists of many small troughs. Users can use fluorescent maker to paint colour on the surface of the foursquare trough to compose their favorite diagram to distinguish switches of different lamps.
Guangdong Industry Technical College
Guangzhou City Guangdong Prov., China
Yuanlong Gui
Chun Yang
Guangdong Industry Technical College
Guangzhou City Guangdong Prov., China
Honghui Yao Guoquan Xu
