@misc{indiciae80e0c2215e85,
  title = {Time division radio relay synchronizing system using different sync code words for in sync and out of sync conditions Patent},
  author = {Campbell, D. R. and Glomb, W. L.},
  year = {1970},
  url = {https://ntrs.nasa.gov/citations/19710010298},
  note = {Source identifier: 19710010298}
}