Member unions of the Japanese Rubber Workers Union Confederation (JRC) have submitted their wage demands at the group’s annual spring labor offensive, directing most of their efforts toward large rubber companies. Looking specifically at the per-company wage demands for 35-year-old workers in the tire industry, unions are demanding a 5,600 yen ($52.70) increase from Bridgestone Corp. (TYO:5108), a 5,500 yen…