See Also
- Acoustic transmission line
- Headphones
- History of the telephone
- Intercom
- Pipe (fluid conveyance)
- Pneumatic tube
- Stethoscope
- Tin can telephone
Read more about this topic: Speaking Tube
Famous quotes containing the word see:
“For the gods, though slow to see, see well, whenever a man casting aside worship turns folly.”
—Sophocles (497–406/5 B.C.)