@misc{indiciaefb6c5a92ef9d,
  title = {Absolute focus lock for microscopes},
  author = {Cone, C. D., Jr. and Loop, R. W. and Tongier, M., Jr.},
  year = {1970},
  url = {https://ntrs.nasa.gov/citations/19700000696},
  note = {Source identifier: 19700000696}
}