- Oak Frequency Control Quartz Crystal & Oscillators
- now: Corning Frequency Control, Inc. - Obo Pro.2, Inc. buzzers, transducers, condenser microphones, mylar speakers
- Ocular, Inc. LCDs
- Odenwälder Kunststoffwerke GmbH & Co. [OKW] enclosures
- ODU-Steckverbindungssysteme Connectors
- check ODU-Advanced Connector Technology too! - OEG (Shenzhen Original Electric Co.,Ltd.)
- acquired by Tyco - OEM [Outstanding Electronic Manufacturer] power supplies
- OFC Quartz Crystal & Oscillators
- now: Corning Frequency Control, Inc. - OhmCraft resistors
- OHMITE Power Resistors
- Okaya displays
- checkOkaya [Japan] too! - OKO Relays Relays
- OKW [Odenwälder Kunststoffwerke GmbH & Co.] enclosures
- OMEG Potentiometer
- Omega Shielding Products, Inc. EMC/EMI Components
- Omig S.A. quartz filters, crystals units, crystal oscillators
- Omron relays, sensors
- check Omron [Japan] too! - OnSpec Oscillators Quartz Crystal & Oscillators
- Operating Technical Electronics power supplies
- Optek Technology, Inc. Optoelectronic, magnetic sensors & fiber optic components
- Optiworks Inc. fiber optic components
- OPTREX CORPORATION LCDs
- Orient Display Limited LCD displays
- Orion Display Technology LCD displays
- Oscilent Corporation quartz crystals, oscillators, SAW filters, ceramic resonators
- Oscillatek Quartz Crystal & Oscillators
- acquired by Vectron Technologies - Oslo Switch Inc. switches
- OSRAM SYLVANIA
- Otto Engineering switches, hesdsets
- Oupiin Enterprise connectors
- Outstanding Electronic Manufacturer [OEM] power supplies
- Oxford Electronics optical fibers
- Oxley Components filters, capacitors, LEDs
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