Every contract of service between any employer and employee covered by this title, written or implied, in operation or made or implied prior to July 17, 1936, shall be presumed to continue, subject to the provisions of this title; and every such contract made subsequent to said date shall be presumed to have been made subject to the provisions of this title.

A like presumption shall exist equally in the case of all minors, unless notice of the same character be given by or to the parent or guardian of the minor.