S. 148A: Reassessment-Conducting inquiry, providing opportunity before issue of notice-Conversion of firm into private limited company-Notice in name of non-existent dissolved firm-Reassessment proceedings initiated against dissolved firm-All transactions actually conducted by successor company using its permanent account number-Department’s failure to consider conversion despite intimation Notice issued under section 148 and reassessment proceedings and reassessment order passed in name of non-existent firm set aside.[S. 142(1) 144, 144B, 147, 148, Art. 226]