S. 151 : Reassessment-Sanction for issue of notice Conducting inquiry, providing opportunity before issue of notice-Not typographical error-Sanction for issue of notice-Principal commissioner-Non application of mind-Approval under section 151 granted without proper application of mind-High Court quashed notices and orders-SLP delay of 181 days-SLP dismissed on grounds of delay and on merits. [S. 148 148A(b), 148A(d), Art. 136]