450. No person to practise as ship surveyor unless qualified.- No person shall in any port in which there is a person exercising the profession of a ship surveyor and holding a certificate granted under section 449 exercise such profession in such port unless he holds a certificate granted under that section: Provided that nothing herein contained shall present any person employed exclusively by Lloyd's Register of Shipping or Bureau Verities or any other classification society specified by the Central Government in the Official in this behalf from discharging any of the duties of such employment or apply to any person specially exempted by the Central Government from the operation of this section. | 
