@misc{indiciaee3407611b22f,
  title = {A precision, active, table-leveling system.},
  author = {Debra, D. B. and Mathiesen, J. C. and Van Patten, R. A.},
  year = {1968},
  url = {https://ntrs.nasa.gov/citations/19680058546},
  note = {Source identifier: 19680058546}
}