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• Yanagi, M.; Nakamura, I.; Ohosugi, M.; Takizawa, K.; Kakinami, M.; Sano, C.
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  Fire-Retardant Sheath and Core Type Conjugate Fiber.
  Toray Industries, Inc., Tokyo, Japan
  U.S. Patent 3,658,634
  U.S. Patent 3,658,634
  April 25, 1972
  14 p.