| Saifun |
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| Sames |
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| Samsung Semiconductor (SEC) |
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| SanDisk |
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| SanRex |
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| Sanyo |
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| ScanLogic (-> Cypress) |
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| Scenix (-> Ubicom) |
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| Seeq (-> LSI Logic) |
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| Seiko Epson |
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| Seiko Instruments (SII) |
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| Semelab |
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| Semicoa Semiconductors |
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| Semiconductor Laser International (SLI) |
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| Semiconductor Technology (STI) |
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| Semikron |
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| Semitron (-> Littelfuse) |
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| Semitronics |
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| Semtech |
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| Sensirion |
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| Sensory |
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| Seoul Semiconductor |
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| SGA |
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| SGS-Thomson (-> STMicroelectronics) |
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| ShareWave (-> Cirrus Logic) |
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| Sharp |
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| Shindengen |
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| SIDSA |
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| Siemens (->Infineon) |
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| Sierra Monolithics |
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| SiGe Microsystems |
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| Sigma Designs |
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| SigmaTel |
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| Signal Processing Technologies (-> Fairchild) |
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| Signetics (-> Philips) |
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| Silicon Bridge |
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| Silicon General Semiconductor (->Linfinity) |
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| Silicon Image |
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| Silicon Integrated Systems (SIS) |
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| Silicon Laboratories |
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| Silicon Power |
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| Silicon Storage Technology (SST) |
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| Silicon Systems (SSI) (-> Texas Instruments) |
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| Siliconians |
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| Siliconix |
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| Silonex |
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| Simtek |
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| Sipex |
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| SiQuest |
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| Sirenza Microdevices |
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| SiRF Technology |
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| SIS Microelectronics (-> Flextronics) |
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| SiTera (-> Vitesse) |
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| Sitronix |
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| Skyworks Solutions |
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| Smartec |
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| SMC (-> SMSC) |
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| Softcom Microsystems (-> Level One) |
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| Solid State Optronics |
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| Solitron Devices |
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| Solomon Systech |
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| Sony |
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| Space Electronics |
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| SPaSE (-> Micronas) |
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| Standard Microsystems Corp. (SMSC, was SMC) |
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| Stanford Microdevices (-> Sirenza) |
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| Stanford Telecom (-> Intel) |
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| Stanley |
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| Statek |
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| STMicroelectronics |
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| Sumitomo Metals (-> i-Chips) |
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| Summit Microelectronics |
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| Sun Microelectronics |
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| Sunplus Technology |
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| Supertex |
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| Sussex Semiconductor |
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| Swindon Silicon Systems (SSSL) |
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| Switchcore |
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| Symbios (-> LSI Logic) |
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| Synergy (-> Micrel) |
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| Synova |
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| Syntec Semiconductor |
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| SystemOnIc |
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