June 7 is a was a big day for Thomas A. Edison. On this day in 1892, Edison received a series of six U.S. patents Nos. 476,527, 476,528, 476,529, 476,530, 476,531, and 476,532 for a “System of Electric Lighting,” an “”Incandescent Electric Lamp,” a “System of Electrical Distribution,” an “Incandescent Electric Lamp,” an “Electric-Lighting System,” and an “Ore-Screening Apparatus” respectively.

Nineteen years earlier. on June 7, 1873, Edison received another patent, on a printing telegraph: