1930s
1930
- UL certifies first automatic dishwasher, first therapeutic carbon arc heat lamp and first waffle iron.
1931
- UL establishes fire test method to evaluate and certify the surface flammability of acoustical materials.
- UL sets up test track at Chicago's Navy Pier where cars with dummy drivers collided head-on to evaluate the possibilities of injury from safety glass under actual crash conditions.
1932
- UL announces a new means of identification of products under Reexamination Service in the form of a “Marker” of distinctive design with the words “Underwriters Laboratories” in a circular design.
1933
- UL tests explosion-proof motors for the U.S. Bureau of Mines.
- UL certifies first electric heating pad.
- UL completes comprehensive research project on fire and explosion hazards of common refrigerants.
1934
- UL introduces a new “Reex Service Marker” for products that consist of a circular design displaying the letters “UL” in the center.
1935
- Alvah Small becomes UL’s third president.
- UL introduces mobile laboratories in cars to test products.
- UL certifies first electric fan.
1936
- Underwriter’s Laboratories, Inc. re-incorporates as a non-profit Delaware corporation.
- Approximately 408,000,000 UL labels were used.
- UL’s East Coast testing station moves to 161 Sixth Avenue in New York City.
1937
- UL’s West Coast testing station moves to 500 Sansome Street, San Francisco.
- UL certifies first automatic washing machine, first automobile directional signals and first torch resisting safe
capable of resisting an oxyacetylene torch attack for one hour.
1938
- UL tests acetylene generators for steel mills.
- UL certifies first electric household food waste disposer, first pressure type wire
connectors, first electric driven food preparing machines, and first earthquake activated gas shut off valve.
1939
- UL certifies first black and white television sets, first electric beauty mask, first hedge trimmers and first x-ray shoe fitter.
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