List of Space Station and Module Companies

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Alcatel Alenia Space http://www1.alcatel-lucent.com/space/index.htm
Bigelow Aerospace http://www.bigelowaerospace.com/
Boeing http://www.boeing.com/
Japan Aerospace Exploration Agency (JAXA) http://www.jaxa.jp/index_e.html
Khrunichev State Research and Production Center http://www.khrunichev.ru/
RSC Energia http://www.energia.ru/english/