| 摘要 |
PROBLEM TO BE SOLVED: To provide an easy carrying and compact instrument composed of a rugged system, where a user can directly access each marking/tracing means. SOLUTION: The instrument comprises a casing with two long and slender supporting surfaces that are mutually perpendicular and extend in two longitudinal directions. A first laser beam generator generates laser beams in a first longitudinal direction. Two levels that are mutually perpendicular confirm whether the supporting surfaces are horizontal. A straight line marking means retractable such as a tracing cord or a graduated tape, is arranged in a second longitudinal direction, and can retract into a casing by extending a second supporting surface and retracting it into the spool with a handle. Such instrument provides considerable easiness in tracing of marks and lines at a construction site and a configuration with an integrated body capable of easily carrying. COPYRIGHT: (C)2006,JPO&NCIPI
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