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Patent Abstract of Japan, vol. 018, No. 010 (C-1152), Jan. 13, 1994 of JP 05 255625 A, Oct. 5, 1993. |
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Derwent Abstract of JP57/057761, Apr. 1982. |
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Derwent absrtact of JP05/255625, Oct. 1993. |
Derwent absrtact of JP62/156179, Jul. 1987. |