Tax exemption recognition under clause 23C(iv) requires exclusive charitable application, restricted investments, and compliance by the notified board. Notification recognizes The Railway Goods Clearing & Forwarding Establishment Labour Board, Mumbai under clause (23C)(iv) of section 10 for assessment years 1990-1991 to 1992-1993, subject to conditions: apply or accumulate income wholly for its objects; restrict investments to forms permitted for charitable funds; exclude business profits unless incidental and separately accounted; file returns regularly; and, on dissolution, transfer surplus and assets to a similar charitable organisation.