ASSOCIATION SERVICES-NAMELY, PROMOTING THE GROWTH OF THE CORRUGATED STEEL PIPE; INDUSTRY; PROMOTING THE USE OF CORRUGATED STEEL PIPE; RESEARCH AND ENGINEERING SERVICE IN THE DESIGN OF DRAINAGE PRODUCTS AND SYSTEMS; AND COLLECTING AND DISSEMINATING PERTINENT TECHNICAL, STATISTICAL, AND BUSINESS INFORMATION
MAY 1, 1958, AS TO "THE DESIGN." MAY 1, 1958, AS TO "THE DESIGN."