Capabilities:

Alerters
Altimeters
Computers
Control Panels
Converters
Gyros
Indicators
Meters
NAV's
Power Supplies
Receivers
Recorders
Transducers

Manufacturers:

Allied Signal
Bendix King
Boeing
Collins
Fairchild
Gables
GE
Grimes Honeywell
Kollsman
Lockheed
Marathon
Sundstrand