■Looseness stop screw （When there is a screw on the companion side.）
┃
┣SPRINGBOLT── "The spring bolt" is the screw which
a cost reduction ┃ and prevention of a return can realize
at the same ┃ time.
┃ (It has been acquired in the patent many
in the ┃ country, America, South
Korea,china,Eu,)
┃ It copes with an environmental problem, too.
┃
┗SPRINGBOLTⅡ─ The generality of "the usual spring bolt"
is strengthened.
