Bone-conducted speech audiometry amplifier.

@article{Culbertson1972BoneconductedSA,
  title={Bone-conducted speech audiometry amplifier.},
  author={M C Culbertson and T E Mabery and S C Shulman},
  journal={Transactions - American Academy of Ophthalmology and Otolaryngology. American Academy of Ophthalmology and Otolaryngology},
  year={1972},
  volume={76 4},
  pages={1015-6}
}