A device for assisting a user in marking an overhead surface to correspond with a mark on a surface below includes a substantially hollow housing having pressurized gas containers received therein. The pressurized gas containers are in communication with a projection barrel extending upwardly from the housing. A lower laser module is positioned on the lower surface of the housing for projecting a laser beam downwardly onto a target mark on an underlying surface. The paint ball projection barrel is coaxial with the lower laser module such that when the laser beam is directed toward the target mark, a paint ball can be projected upwardly to produce an overhead mark that is axially aligned with the target mark.

 
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> Precise transport positioning apparatus using a closed loop controlled, non-direct drive or friction drive system with absolute positioning encoder

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