1. 
   Keyer
   A keyer is a device for signaling by hand, by way of pressing one or more switches. Modern keyers typically have a large number of switches but not as many as a full-size keyboard; typically between four and fifty. A keyer differs from a keyboard in the sense that there is no "board"; the keys are ...
   Found op http://en.wikipedia.org/wiki/Keyer
   
   
2. 
   Keyer
   A solid-state device providing the first stage of amplification in a linac modulator. The light-pipe input to the modulator is amplified to about 1 kV by the keyer.
   Found op http://www-bdnew.fnal.gov/operations/accgloss/gloss.html
   
   
3. 
   Keyer
   A solid-state device providing the first stage of amplification in a linac modulator. The light-pipe input to the modulator is amplified to about 1 kV by the keyer.
   Found op http://www-bdnew.fnal.gov/operations/accgloss/gloss.html#A
   
   

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