THE CERTIFICATION MARK AS USED BY PERSONS AUTHORIZED BY APPLICANT CERTIFIES THE COMPLIANCE WITH STANDARDS OF BREATHING AIR PURITY.
No claim is made to the exclusive right to use the language "Pure Air Station" and the underwater diving flag, apart from the mark as shown.
The lining shown in the mark is a feature of the mark and does not indicate color.
SEC. 2(F) AS TO "PROFESSIONAL ASSOCIATION OF DIVING INSTRUCTORS".