| 摘要 |
PURPOSE:To prevent the generation of accident beforehand by installing screws at the bow and on the both sides of ship's space and permitting the screws to be transferred speedily. CONSTITUTION:Screws 2 are installed at the part under the draught at the bow of a vessel and on the both sides of ship's space 1. The direction of the bow is speedily changed to prevent the generation of accident by shifting the screws 2 forward and right and left during navigation.
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