@misc{indiciae47e9c9719008,
  title = {Method and apparatus for aligning a laser beam projector Patent},
  author = {Allen, L. H. and Shumate, M. S. and Westphal, J. A.},
  year = {1971},
  url = {https://ntrs.nasa.gov/citations/19710019649},
  note = {Source identifier: 19710019649}
}