| 摘要 |
PROBLEM TO BE SOLVED: To resolve the problem that a lecturer or a presenter cannot decide which of a pointer and a laser point to take because he or she doesn't know which to use in accordance with the dimensions of a hall and the problem that it is difficult to see the red point of the laser pointer at the time of pointing a screen in a dark and large hall. SOLUTION: An expansible pointer and the laser pointer are integrated, and the expanding/contracting direction and the optical axis of the laser pointer are arranged in parallel.
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