US Patent 10132629 Carpenter's level attachment for hanging pictures

A carpenter's level attachment system for hanging pictures is described and claimed. The attachment comprises a bridge portion and a marker portion. The bridge portion includes a first leg, a span, and a second leg. These legs and span are adapted to fit over the respective top, sides and bottom of a typical carpenter's level. A markers portion is affixed to the bridge portion and has means for leaving a mark on the wall on which the pictures are to be hung. Two or more attachments can be clamped to the carpenter's level so that, when the respective marker portions are actuated, two or more marks are left on the wall, and those marks arc horizontally aligned.