EP595466-A1  PATENT ABSTRACTS OF JAPAN vol. 12, no. 430 (E-682)(3277) 14 November 1988;  PATENT ABSTRACTS OF JAPAN vol. 17, no. 015 (E-1305)12 January 1993;  PATENT ABSTRACTS OF JAPAN vol. 9, no. 143 (E-322)(1866) 18 June 1985;  CHEMICAL ABSTRACTS, vol. 71, no. 2, 14 July 1969, Columbus, Ohio, US; abstract no. 9111k, RUSIN,A.I. "REFERENCE POSITIVE ELECTRODE FOR THE TELEMETERING OF THE ELECTROLYTE DENSITY IN LEAD-ACID STORAGE CELL BY AN ELECTROMOTIVE FORCE METHOD" page 486;column 1;  PATENT ABSTRACTS OF JAPAN vol. 8, no. 176 (E-260)14 August 1984;  PATENT ABSTRACTS OF JAPAN vol. 9, no. 151 (P-367)(1874) 26 June 1985;  CHEMICAL ABSTRACTS, vol. 71, no. 2, 14 July 1969, Columbus, Ohio, US; abstract no. 9111k, RUSIN,A.I. 'REFERENCE POSITIVE ELECTRODE FOR THE TELEMETERING OF THE ELECTROLYTE DENSITY IN LEAD-ACID STORAGE CELL BY AN ELECTROMOTIVE FORCE METHOD' page 486 ;column 1 ; & SU-A-235 117 (RUSIN);  PATENT ABSTRACTS OF JAPAN vol. 12, no. 430 (E-682)(3277) 14 November 1988 & JP-A-63 166 169 (JAPAN STORAGE BATTERY CO LTD);  PATENT ABSTRACTS OF JAPAN vol. 17, no. 015 (E-1305)12 January 1993 & JP-A-04 245 171 (SHIN KOBE ELECTRIC MACH CO LTD) 1 September 1992;  PATENT ABSTRACTS OF JAPAN vol. 8, no. 176 (E-260)14 August 1984 & JP-A-59 071 272 (NIHON DENCHI K.K);  PATENT ABSTRACTS OF JAPAN vol. 9, no. 143 (E-322)(1866) 18 June 1985 & JP-A-60 023 979 (NIHON DENCHI K.K);  PATENT ABSTRACTS OF JAPAN vol. 9, no. 151 (P-367)(1874) 26 June 1985 & JP-A-60 029 635 (NIHON DENCHI K.K);  PATENT ABSTRACTS OF JAPAN vol. 8, no. 176 (E-260)14 August 1984&JP-A-59 071 272 (NIHON DENCHI K.K);  PATENT ABSTRACTS OF JAPAN vol. 9, no. 151 (P-367)(1874) 26 June 1985&JP-A-60 029 635 (NIHON DENCHI K.K);  PATENT ABSTRACTS OF JAPAN vol. 9, no. 143 (E-322)(1866) 18 June 1985&JP-A-60 023 979 (NIHON DENCHI K.K);  CHEMICAL ABSTRACTS, vol. 71, no. 2, 14 July 1969, Columbus, Ohio, US; abstract no. 9111k, RUSIN,A.I. 'REFERENCE POSITIVE ELECTRODE FOR THE TELEMETERING OF THE ELECTROLYTE DENSITY IN LEAD-ACID STORAGE CELL BY AN ELECTROMOTIVE FORCE METHOD' page 486 ;column 1 ;&SU-A-235 117 (RUSIN);  PATENT ABSTRACTS OF JAPAN vol. 12, no. 430 (E-682)(3277) 14 November 1988&JP-A-63 166 169 (JAPAN STORAGE BATTERY CO LTD);  PATENT ABSTRACTS OF JAPAN vol. 17, no. 015 (E-1305)12 January 1993&JP-A-04 245 171 (SHIN KOBE ELECTRIC MACH CO LTD) 1 September 1992