Assertion: commercial yeast | /r/HasProperty | marketed at the centennial exposition
Facets:
value: in philadelphia
type: LOCATION
value: in 1876
type: TEMPORAL
Source sentences:
text: In the United States, naturally occurring airborne yeasts were used almost exclusively until commercial yeast was marketed at the Centennial Exposition in 1876 in Philadelphia, where Charles L. Fleischmann exhibited the product and a process to use it, as well as serving the resultant baked bread.