
Early C20 Canadian ultraviolet therapy apparatus
1900-1930
1900-1930
1925
circa 1921
1925
1993
circa 1925
1920
1925
1922
1926
circa 1919
1928
circa 1924
1929
circa 1921
1922
circa 1919
circa 1940
1982
1905; circa 1905
1922
1922
1955
1926
1919
circa 1920
1917-1926
circa 1934
1924-1933
1926-1931
1924-1933
1922
1923
1916-1924
1924-1926
1924-1933
1925
1924-1933
1917-1925
1907-1924
1908-1934
1917-1925