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| F | CT, Fairchild, Intel, NS, TI, Toshiba | 
| FB | Philips | 
| FC | Cinch | 
| FDC* | Samsung, SMC | 
| FE | GI | 
| FEP | GI | 
| FES | GI | 
| FLT | Datel | 
| FM* | Ascom | 
| FMMD | Zetex | 
| FMMT | Zetex | 
| FMPG | Philips | 
| FR | Micron | 
| FS | Fairchild, Mitsubishi | 
| FSA | Fairchild | 
| FSS | Ferranti | 
| FT | Fuji | 
| FTD | Philips | 
| FX | CML (older devices) | 
| FZT | Zetex | 
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