| 摘要 |
PROBLEM TO BE SOLVED: To solve the problem of obligingly using the both hands in detecting the position of the wall backing on the finished wall surface, wherein a worker holds a wall backing detector in the right hand and puts a mark with a pencil held in the left hands, so as to put the mark by single hand in the position of the backing on the finishing surface of the wall after detecting the wall backing. SOLUTION: A writing material holder is attached to the wall backing detector in a position to be put the mark after detecting the backing. |
