Inventions 8thVersion en ligne Práctica del pasado simple. Descubre el invento recurriendo al menor número posible de pistas. par Omar Yesid Lizarazo 1 It was invented in United States Hints 1 It was invented in 1879 2 It was invented by Thomas Alva Edison 3 This invention produced light in the life of humans. 4 This invention allowed to improve the level of technology in the world. 5 This invention allowed to connect people 6 This invention was the electrical system.