Weis-Service (Popularity: )
http://www.reed-switches.com Manufacturing of coils, chokes, toroids, transformers, reed-switches, reed-sensors and optical sensors.
Wilco Corporation (Popularity: )
http://www.wilcocorp.com/ Manufacturer of inductors, chokes, and coils specializing insurface mount power inductors, surface mount chip inductors, and ferritedrum core inductors.