| 2N2221A | K0268 | RAYTHEON SYSTEMS LIMITED |
| 2N2221A | K0461 | RAYTHEON SYSTEMS LTD WEAPONS SUPPORT GROUP |
| 2N2221A | K5519 | MOTOROLA UK SALES LTD MOTOROLA SEMICONDUCTORS GROUP |
| 2N2221A | K6659 | FAIRCHILD SEMICONDUCTORS LTD |
| 2N2221A | K7093 | NATIONAL SEMICONDUCTOR UK LTD |
| 2N2221A | K7575 | NORTEL |
| SS20032-1 | K0991 | MARCONI COMMUNICATION SYSTEMS LTD |
| 2N2221A | S3343 | RAYTHEON PRODUCTS TRANSISTOR AG |
| 2N2221A | U0639 | MEMEC LTD |
| SS20032-1 | U2248 | SELEX ELSAG LTD |