PROMOTION AND DEVELOPMENT OF THE LIQUIFIED PETROLEUM GAS INDUSTRY WITHIN THE STATE OF IOWA AND THE COORDINATION OF ITS ACTIVITIES TO THE END THAT IT MAY SERVE TO THE FULLEST POSSIBLE EXTENT THE BEST INTERESTS OF ITS MEMBERS AND THE PUBLIC; ADVANCEMENT TO THE HIGHEST EFFICIENCY OF THE METHODS OF DISTRIBUTION, UTILIZATION, SAFETY, SALES AND ACCOUNTING EMPLOYED IN THE LIQUIFIED PETROLEUM INDUSTRY; RE…