"Occupational disease" means such disease or infection as arises naturally and proximately out of employment under the mandatory or elective adoption provisions of this title.
[ 1961 c 23 § 51.08.140. Prior: 1959 c 308 § 4; 1957 c 70 § 16; prior: 1951 c 236 § 1; 1941 c 235 § 1, part; 1939 c 135 § 1, part; 1937 c 212 § 1, part; Rem. Supp. 1941 § 7679-1, part.]