An aquatic show boat has a pair of separated, long narrow hulls joined in a parallel fashion (catamaran like) by a plurality of connecting pieces which together with both hulls enclose the perimeter of at least one activity area. Demonstrations, exhibits and recreation, etc. in an activity area can be...http://www.google.com.tw/patents/US4854256?utm_source=gb-gplus-share專利 US4854256 - Aquatic show boat
