In 1928, the engineer Ricardo Esquível Teixeira Duarte, tendered, in his own name, for the Construction Contract of the Vila Real de Santo António Port Quay, which was awarded to him, thus becoming the first Portuguese maritime works contractor.

At this time, the Company's activity was mainly focused on a second contract for the construction of the Port of Vila Real de Santo António, with a few more small boreholes, the construction of a reinforced concrete tank and the foundations of a small bridge until the end of 1933, when this major work was completed.