川石岛是闽江口第三大岛，与马祖列岛仅一水之隔，隶属于福建省连江县。
比如，昭荣汽船的背后是今治集团，而海商株式会社显然与石川岛播磨造船集团有关。
Shoei Kisen, for instance, is associated with Imabari, while Kaisho appears to be related to the IHI shipbuilding conglomerate.
日本航空宇宙技术研究所和石川岛播磨重工业公司目前正在开展这方面的研究工作。
LTD(IHI) is conducting development study of Air Turbo-Ramjet(ATR) engine, which is one of the most preferable candidate as an air breathing propulsion system of future space plane.
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