Towa Pharmaceutical Ractab Dome is an indoor sporting arena located in Kadoma city in the Osaka Prefecture of Japan. Construction was completed in early 1996. The primary architect was Mamoru Kawaguchi, founder of the firm Kawaguchi & Engineers. The dome is composed largely of reinforced concrete and steel frames and covers an area of approximately 25,000 m2. Inside is a main competition arena plus a separate swimming pool, training room, multipurpose hall, conference rooms and Restaurant Namihaya. The main arena has 6,000 fixed seats with a possible capacity for 10,000 people. There is a large screen display and a large electrical score screen.
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