39. Sections 33 to 38 shall not apply to any work or improvement of the same nature as those mentioned in such sections, which has been executed or constructed before 9 February 1918, nor to any work or improvement of a temporary nature which it may become necessary to execute or construct during the actual operation of the driving or floating of any timber, raft or craft.
R. S. 1964, c. 84, s. 39.