1958: Vernon Gleasman patents the Torsen dual-drive differential, a type of limited-slip differential that relies solely on the action of gearing, instead of a combination of clutches and gears.
1958 – Vernon Gleasman patenterer Torsen Dual-Drive Differentialgear, en type af en:limited slip differential som kun anvender tandhjul i stedet for en kombination af koblinger og tandhjul.