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OCR: 1878 1879 Elihu Thomson William Crookes demonstrates his invents cathode- alternating -current a tube dynamo 1879 William, Edison' Demonstrates Invents first practical third child born phonograph for U.S incandescent lamp; Joseph Grosvenor P. Lowrey President Hayes at Swan (U.K.) patents similar others finance Edison's White House design 1879 research on Tests microtasimeter Improves the dynamo; Gives public incandescent lamp device for measuring devises systemsof distribut 1on demons tration of his Edison Electric Lighi heat while on camping regulation, measurement lighting system ir Company founded trip to Wyoming electric current Menlo Park ncandescen 1870 namo incand lescent Light