EP440968-A1  PATENT ABSTRACTS OF JAPAN, Band 11, Nr. 220 (E-524), 16. Juli 1987; &amp; JP-A 62 040 168 (MITSUBISHI ELECTRIC CORP.) 21-02-1987;  PATENT ABSTRACTS OF JAPAN, Band 11, Nr. 220 (E-524), 16. Juli 1987; &amp; JP-A62 040 168 (MITSUBISHI ELECTRIC CORP.) 21-02-1987;  PATENT ABSTRACTS OF JAPAN, Band 11, Nr. 292 (E-543)2739, 19. September 1987; &amp; JP-A-62 90 871 (HITACHI LTD) 25-04-1987;  PATENT ABSTRACTS OF JAPAN, Band 11, Nr. 292 (E-543)[2739], 19. September 1987; &amp; JP-A-62 90 871 (HITACHI LTD) 25-04-1987;  PATENT ABSTRACTS OF JAPAN, Band 12, Nr. 277 (E-640)3124, 30. Juli 1988; &amp; JP-A-63 58 769 (HITACHI LTD) 14-03-1988;  PATENT ABSTRACTS OF JAPAN, Band 12, Nr. 277 (E-640)[3124], 30. Juli 1988; &amp; JP-A-63 58 769 (HITACHI LTD) 14-03-1988;  PATENT ABSTRACTS OF JAPAN, Band 12, Nr. 420 (E-679)3267, 8. November 1988; &amp; JP-A-63 158 754 (MITSUBISHI ELECTRIC CORP.) 01-07-1988;  PATENT ABSTRACTS OF JAPAN, Band 12, Nr. 420 (E-679)[3267], 8. November 1988; &amp; JP-A-63 158 754 (MITSUBISHI ELECTRIC CORP.) 01-07-1988;  PATENT ABSTRACTS OF JAPAN, Band 13, Nr. 38 (E-709)3386, 27. Januar 1989; &amp; JP-A-63 236 265 (HITACHI LTD) 03-10-1988;  PATENT ABSTRACTS OF JAPAN, Band 13, Nr. 38 (E-709)[3386], 27. Januar 1989; &amp; JP-A-63 236 265 (HITACHI LTD) 03-10-1988;  PATENT ABSTRACTS OF JAPAN, Band 14, Nr. 117 (E-898)4060, 5. M{rz 1990; &amp; JP-A-1 313 855 (NKK CORP.) 19-12-1989;  PATENT ABSTRACTS OF JAPAN, Band 14, Nr. 117 (E-898)[4060], 5. M rz 1990; &amp; JP-A-1 313 855 (NKK CORP.) 19-12-1989;  PATENT ABSTRACTS OF JAPAN, Band 14, Nr. 12 (E-871)3955, 11. Januar 1990; &amp; JP-A-1 258 365 (HITACHI LTD) 16-10-1989;  PATENT ABSTRACTS OF JAPAN, Band 14, Nr. 12 (E-871)[3955], 11. Januar 1990; &amp; JP-A-1 258 365 (HITACHI LTD) 16-10-1989;  PATENT ABSTRACTS OF JAPAN, Band 10, Nr. 317 (E-449)2373, 28. Oktober 1986; &amp; JP-A-61 128 470 (HITACHI LTD) 16-06-1986;  PATENT ABSTRACTS OF JAPAN, Band 10, Nr. 317 (E-449)[2373], 28. Oktober 1986; &amp; JP-A-61 128 470 (HITACHI LTD) 16-06-1986EP440968-A  PATENT ABSTRACTS OF JAPAN, Band 11, Nr. 220 (E-524), 16. Juli 1987; &amp; JP-A 62 040 168 (MITSUBISHI ELECTRIC CORP.) 21-02-1987;  PATENT ABSTRACTS OF JAPAN, Band 11, Nr. 292 (E-543)[2739], 19. September 1987; &amp; JP-A-62 90 871 (HITACHI LTD) 25-04-1987;  PATENT ABSTRACTS OF JAPAN, Band 12, Nr. 277 (E-640)[3124], 30. Juli 1988; &amp; JP-A-63 58 769 (HITACHI LTD) 14-03-1988;  PATENT ABSTRACTS OF JAPAN, Band 12, Nr. 420 (E-679)[3267], 8. November 1988; &amp; JP-A-63 158 754 (MITSUBISHI ELECTRIC CORP.) 01-07-1988;  PATENT ABSTRACTS OF JAPAN, Band 13, Nr. 38 (E-709)[3386], 27. Januar 1989; &amp; JP-A-63 236 265 (HITACHI LTD) 03-10-1988;  PATENT ABSTRACTS OF JAPAN, Band 14, Nr. 117 (E-898)[4060], 5. M rz 1990; &amp; JP-A-1 313 855 (NKK CORP.) 19-12-1989;  PATENT ABSTRACTS OF JAPAN, Band 14, Nr. 12 (E-871)[3955], 11. Januar 1990; &amp; JP-A-1 258 365 (HITACHI LTD) 16-10-1989;  PATENT ABSTRACTS OF JAPAN, Band 10, Nr. 317 (E-449)[2373], 28. Oktober 1986; &amp; JP-A-61 128 470 (HITACHI LTD) 16-06-1986;  PATENT ABSTRACTS OF JAPAN, Band 10, Nr. 317 (E-449)[2373], 28. Oktober 1986; & JP-A-61 128 470 (HITACHI LTD) 16-06-1986;  PATENT ABSTRACTS OF JAPAN, Band 11, Nr. 220 (E-524), 16. Juli 1987; & JP-A^362 040 168 (MITSUBISHI ELECTRIC CORP.) 21-02-1987;  PATENT ABSTRACTS OF JAPAN, Band 11, Nr. 292 (E-543)[2739], 19. September 1987; & JP-A-62 90 871 (HITACHI LTD) 25-04-1987;  PATENT ABSTRACTS OF JAPAN, Band 12, Nr. 277 (E-640)[3124], 30. Juli 1988; & JP-A-63 58 769 (HITACHI LTD) 14-03-1988;  PATENT ABSTRACTS OF JAPAN, Band 12, Nr. 420 (E-679)[3267], 8. November 1988; & JP-A-63 158 754 (MITSUBISHI ELECTRIC CORP.) 01-07-1988;  PATENT ABSTRACTS OF JAPAN, Band 13, Nr. 38 (E-709)[3386], 27. Januar 1989; & JP-A-63 236 265 (HITACHI LTD) 03-10-1988;  PATENT ABSTRACTS OF JAPAN, Band 14, Nr. 117 (E-898)[4060], 5. Maerz 1990; & JP-A-1 313 855 (NKK CORP.) 19-12-1989;  PATENT ABSTRACTS OF JAPAN, Band 14, Nr. 12 (E-871)[3955], 11. Januar 1990; & JP-A-1 258 365 (HITACHI LTD) 16-10-1989