In Re the Arbitration Between National Cash Register Co. & Wilson

In 1952, petitioner National Cash Register Company and the Union, which represented the Company’s production and maintenance employees, entered into a five-year collective bargaining agreement, providing, among other things, for seniority rights of the employees. In the Autumn of 1956, the Union called an economic strike, concededly lawful, which was terminated on December 26, shortly after two strike settlement supplemental agreements — one dated December 20, the other December 24—were executed.

The Memorandum of Agreement of December 20 extended the original 1952 collective bargaining…