S. 263 : Commissioner – Revision of orders prejudicial to revenue –Change in share holding of more than 51 %-Holding company of assessee, had transferred its shareholding in assessee-company to another company which was again its subsidiary company – On facts, even after transfer of shares by assessee’s ultimate holding company to another subsidiary, beneficial ownership of assessee-company –Revision is not held to be valid and provisions of S. 79 would not apply [ S. 79 ]