68. A collective agreement made by an employers’ association shall be binding upon all employers who are members of such association and to whom it can apply, including those who subsequently become members thereof.
A collective agreement made by an association of school corporations shall bind those only which have given it an exclusive mandate as provided in section 11.
R. S. 1964, c. 141, s. 56; 1965 (1st sess.), c. 50, s. 4.