'Joseph Swan had this bright idea in England at the same time Edison did in the U.S.'
an electric light bulb
SCIENTISTS: Joseph Swan had this bright idea in England at the same time Edison did in the U.S.
Joseph Swan had this bright idea in England at the same time Edison did in the U.S.
Joseph Swan had this bright idea in England at the same time Edison did in the U.S.
SCIENTISTS
an electric light bulb
SCIENTISTS