@misc{indiciae004e2485785b,
  title = {Tone-activated, remote, alert communication system},
  author = {Baker, C. D. and Couvillon, L. A. and Hubbard, W. P. and Kollar, F. J. and Postal, R. B. and Tegnelia, C. R.},
  year = {1971},
  url = {https://ntrs.nasa.gov/citations/19710000305},
  note = {Source identifier: 19710000305}
}