@misc{indiciaee074f2016e6d,
  title = {Portable headset microphone checker},
  author = {Davenport, J. and Foster, J. A. and Langley, W. R.},
  year = {1975},
  url = {https://ntrs.nasa.gov/citations/19750000254},
  note = {Source identifier: 19750000254}
}