Method of Operating Electro Magnetic Motors 130 0 Download here USA022 - US401520 Print Rate this article: No rating No.USA22Patent401,52Year1889CountryUnited States of AmericaDate of ApplicationApril 16, 1889Patent TitleMethod of Operating Electro Magnetic Motors Documents to download USA022 - US401520 (.pdf, 276.69 KB) - 98 download(s)