Dee ihe ọzọ maka paragraf a - N'ihe banyere nkà na ụzụ, ụlọ ahụ gafere oge ya. Ụlọ ọrụ Ray Oil Burner nke San Francisco rụnyere usoro mmanụ ọkụ na-akpaghị aka ọhụrụ, nke a na-egosighi n'ihu ọha na Bay Area ruo mgbe ngosi ngosi Panama Pacific nke 1915
na San Francisco. Tụkwasị n'ime ka ụlọ ahụ na-ekpo ọkụ, usoro ihe owuwu ahụ mere ka ndị na-ebuga akwụkwọ ozi nwee ụlọ ịsa ahụ́ na-ekpo ọkụ. Na March 9, 1910, Post Master H. L. Tripp na ndị ọrụ nzipu ozi ya kwagara n'ụlọ ọrụ nzipu ozi Santa Rosa e wuchara ọhụrụ.