Tax exemption notification under section 10(23C)(iv) designates Seva Sangh Samiti as eligible for specified assessment years. Central Government, exercising powers under section 10(23C)(iv) of the Income-tax Act, 1961, notifies Seva Sangh Samiti as eligible under that clause for the assessment years 1979-80 to 1982-83, specifying the temporal scope of the notification for purposes of the provision.