 The lawsuits with the "Göbel defense" continued until May 1894.The work for the "American Electric Light Co." 1881, the patents from 1882, and the report in the "New York Times" from April 30, 1882 are the earliest clear sources for work of Heinrich Göbel related to incandescent electric light bulbs.No earlier source is known to prove any kind of relation to incandescent light bulbs or any kind of work in the field of electricity.