@misc{indiciaebdfaf8638be2,
  title = {Two-step rocket engine bipropellant valve Patent},
  author = {Capps, J. E. and Ferguson, R. E. and Pohl, H. O.},
  year = {1969},
  url = {https://ntrs.nasa.gov/citations/19700012887},
  note = {Source identifier: 19700012887}
}