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When using an electric drill, problems encountered,
we not know the location to punch ， whether in
the same horizontal plane, Do not know the distance ,
It give great inconvenience to our work.
I designed laser drilling machine ，It use the principle
of laser irradiation, the punch position when the electric
drill laser shot to the front of the wall, there will be,
will be very easy to find. Convenient operation, design
Maojin Ye Ruili Sun Jianwen Zheng Fanmin Kong