<classify> Ọ bịarutere na US ninwe centị anọ naha ya, otu akwụkwọ nke uri, ya na otu akwụkwọ ozi nke nkwanye sitere na Charles Batchelor onye njikwa ya nọrụ ya gara aga ruo Thomas Edison.  <topic>: Nikola Teslamiddle years 