| 1F427 | K0851 | MINISTRY OF DEFENCE DIRECTORATE OF STANDARDIZATION STAN 1 |
| 5330-857122 | U1278 | MINISTRY OF DEFENCE NAVY |
| PC64611-427 | K0991 | MARCONI COMMUNICATION SYSTEMS LTD |
| BS1806-427 | K7766 | BRITISH STANDARDS INSTITUTION |
| BSM48-427 | K7766 | BRITISH STANDARDS INSTITUTION |
| PC64611-427 | U2248 | SELEX ELSAG LTD |
| SSML7-17 | K0851 | MINISTRY OF DEFENCE DIRECTORATE OF STANDARDIZATION STAN 1 |
| SSML7-17-1F427 | K0851 | MINISTRY OF DEFENCE DIRECTORATE OF STANDARDIZATION STAN 1 |