| 摘要 |
On the lower part of a rubber roller(3)(3a), support pieces(1a)(1b) are arranged, a pair of pipes(5)(5a) are horizontally installed in parallel at certain interval(p), where a front and rear pipe face, an air-through parts(51)(52) are provided. Thus, inside the pipe, a projector(6) and an acceptor(7) are installed toward the air-through part, the accepted signal is connected to CPU, with the handle of a shaft(31) suspended at the supporters(10)(11).
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