@misc{indiciae4636dee8fbe7,
  title = {Force-Balanced, Throttle Valve Patent},
  author = {Mcdougal, A. R. and Porter, R. N. and Riebling, R. W.},
  year = {1971},
  url = {https://ntrs.nasa.gov/citations/19710017956},
  note = {Source identifier: 19710017956}
}