Last seen in:
- Universal - May 18 2015
- Thomas Joseph - King Feature Syndicate - Nov 8 2013
- New York Times - Apr 23 2012
- The Chronicle of Higher Education - Jan 13 2012
- The Telegraph - QUICK CROSSWORD NO: 25,661 - Jul 5 2008
- USA Today - Jan 17 2007
- New York Times - Jun 15 2005
- Universal - Apr 7 2005
- Thomas Joseph - King Feature Syndicate - Feb 22 2005
- New York Times - Mar 29 2004
Related Clues:
- Lightbulb component
- Simple semiconductor
- Electrical rectifier
- Girl with poem in the tube
- LED's D
- Semiconductor type
- Vacuum tube which was the first practical electronic amplifier
- Short journey with poem in the Tube
- Amplifier of radio signals
- Part of a crystal radio kit
- Two-element semiconductor
- Vacuum tube with three components
- The "D" of LED
- Light-emitting ___
- LED component?