| 摘要 |
<p>PURPOSE:To provide a cage type boat whose service life is sufficiently long. CONSTITUTION:In a cage type boat provided with a plurality of slits, a hole 15 having a width larger than or equal to 1.8 times the slit width is formed on the end portion of the slit 14. The hole 15 is arranged to be shifted in the longitudinal direction of the slit 14.</p> |
