Patent Abstracts of Japan, vol. 13, No. 333 (E-794), 26 Jul. 1989 & JP-A-01-096952 (Hitachi Ltd), 14 Apr. 1989. |
Patent Abstracts of Japan, vol. 15, No. 62 (E-1033), 14 Feb. 1991 & JP-A-02-288255 (Hitachi Ltd), 28 Nov. 1990. |
Patent Abstracts of Japan, vol. 16, No. 381 (E-1248), 14 Aug. 1992 & JP-A-04-122053 (Fujitsu Ltd), 22 Apr. 1992. |
Patent Abstracts of Japan, vol. 17, No. 415 (E-1407), 3 Aug. 1993 & JP-A-05-082584 (NEC Corp), 2 Apr. 1993. |
Patent Abstracts of Japan, vol. 18, No. 299 (E-1558), 8 Jun. 1994 & JP-A-06-061383 (Fujitsu Ltd), 4 Mar. 1994. |