1. Instrument for the extention of the suspention rope of the balloon gondola;Ohta;Bull. Inst. Spac. Aeron. Sci. Univ. Tokyo,1973
2. Balloon-borne winches for reeling down payload instruments;Matsuzaka;Bull. Inst. Spac. Astron. Sci.,1983
3. Systems for long duration flights;Nishimura;Adv. Space Res.,1981
4. Automatic control of balloon altitude;Fujii,1982
5. Reel-up and -down system for balloon-borne instruments;Matsuzaka,1984