All contracts of employment made on or after September 7, 1967, shall be presumed to have been made with reference to and subject to the provisions of this article. All contracts of employment made prior to and existing on September 7, 1967, shall be presumed to continue from and after said date, subject to and under the provisions of this article. Every employer and every employee shall be presumed to have accepted and come under this article and the provisions thereof relating to the payment and acceptance of compensation.