| 10G17167 | U1725 | MINISTRY OF DEFENCE AIR DOMESTIC R FERENCE NUMBER USE ONLY |
| 30-232-059-11 | K0481 | SMITHS INDUSTRIES LTD |
| 5815-99N31-4759 | K0997 | BABCOCK COMMUNICATIONS LIMITED |
| 30-232-059-11 | K5294 | GE AVIATION SYSTEMS LIMITED |
| 6A12514 | U1725 | MINISTRY OF DEFENCE AIR DOMESTIC R FERENCE NUMBER USE ONLY |
| 6TD1570 | U1725 | MINISTRY OF DEFENCE AIR DOMESTIC R FERENCE NUMBER USE ONLY |
| Z2ZB12755 | K3826 | MINISTRY OF DEFENCE ARMY |
| PS2457-1 | K4178 | ASTON COMMUNICATIONS |
| BS57 | K7766 | BRITISH STANDARDS INSTITUTION |
| BS57-TABLE 1 | K7766 | BRITISH STANDARDS INSTITUTION |