General Motors announced a General Motors plant in Janesville a General Motors plant in Janesville until April of 2009 General Motors announced General Motors announced http://en.wikipedia.org/wiki/Janesville_GM_Assembly_Plant ning of the plant in 1919 General Motors announced http://en.wikipedia.org/wiki/Janesville_GM_Assembly_Plant http://en.wikipedia.org/wiki/Janesville_GM_Assembly_Plant http://en.wikipedia.org/wiki/Janesville_GM_As... Wikipedia General Motors announced http://en.wikipedia.org/wiki/Janesville_GM_Assembly_Plant http://en.wikipedia.org/wiki/Janesville_GM_As... http://en.wikipedia.org/wiki/Janesville_GM_As...