Patrick C. Wilda’s father sued JLG Industries in the Northern District of Illinois for manufacturing and distributing a manlift that didn’t have SkyGuard — optional safety equipment available from JLG that allegedly would have saved Patrick’s life when he was crushed between a roof joist and the manlift’s control panel while working for Area Erectors during construction of a warehouse. Turning things around, JLG insisted it was entitled to summary judgment because... the manlift wasn’t …