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Now we have many problems with the thumbtacks, the most serious problem is the
exposed sharp nail part can easily hurt people. Maybe we have ever had such
experience: Prick the finger when you take thumbtacks or step on fell to the ground
thumbtacks accidentally. "BLINKING THUMBTACK" by innerspring ingeniously solved
this problem. Although the volume increases, more secure and convenient to use.It has two pinheads, when not in use, two pinheads are
in the shell.Pinch the operating area and the pinheads
will stick out,then we can use it normally.Loosen your
hand and the pinheads back automatically.
Dalian Minzu University
Dalian Nationalities University