TY  - RPRT
TI  - Telephone multiline signaling using common signal pair
AU  - Goodloe, R. R.
AU  - Toole, P. C.
AU  - Belt, J. L.
AU  - Leininger, D. B.
PY  - 1979
UR  - https://ntrs.nasa.gov/citations/19790015139
ID  - 19790015139
ER  -