1930 - sunlamp (carbon arc) 1930 - sunlamp (mercury) 1931 - sunlamp (mercury) 1932 - Matthew Luckiesh 1934 - sunlamp (mercury) 1935 - sunlamp (carbon arc) 1936 - sunlamp (mercury) 1936 - other (heat and light) 1937 - sunlamp (mercury) 1937 - other (heat and light) 1938 - sunlamp (blended) 1938 - sunlamp (carbon arc) 1939 - sunlamp (blended) 1939 - other (massage with heat)