@misc{indiciae06ff43f91cd7,
  title = {A simple multichannel preamplifier system with patch board.},
  author = {M J Kloprogge and G A Hurkmans},
  year = {1973},
  doi = {10.3109/13813457309074482},
  url = {https://pubmed.ncbi.nlm.nih.gov/4128280/},
  note = {Source identifier: 4128280}
}