Method of Operating Arc Lamps 140 0 Download here USA041 - US447920 Print Rate this article: No rating No.USA41Patent447,92Year1891CountryUnited States of AmericaDate of ApplicationMarch 10, 1891Patent TitleMethod of Operating Arc Lamps Documents to download USA041 - US447920 (.pdf, 169.06 KB) - 114 download(s)