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0 002 617 | Jun 1979 | EPX |
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WO 9211592 | Jul 1992 | WOX |
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Entry |
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Patent Abstracts of Japan vol. 14 No. 568 (E-1014), 18 Dec. 1990, JP-A-02 246550 (Fujitsu LTD) 2 Oct. 1990, *abstract* . |