| 9 | Aerial amplifiers | | M | | M | | V |
| 9 | Aerial cables for heavy currents | | M | | M | | |
| 9 | Aerial combiners | | M | | M | | |
| 9 | Aerials | | M | M | M | | M |
| 9 | Aerometers | | M | M | M | | M |
| 9 | Aeronautical radio communication machines and apparatus | | M | | M | | |
| 9 | Air analysis apparatus | | M | M | M | | M |
| 9 | Air/fuel ratio gauges | | M | | M | | M |
| 9 | Air tanks [for scuba diving] | | V | | M | | |
| 9 | Air tanks for use in scuba diving | | M | | M | | |
| 9 | Air traffic control radio equipment | | M | | M | | M |
| 9 | Alarm bells, electric | | M | M | M | | M |
| 9 | Alarm central units | | M | | M | | |
| 9 | Alarm sensors | | M | | M | | M |
| 9 | Alarms for the detection of inflammable gases | | M | | M | | |
| 9 | Alcoholmeters | | M | M | M | | M |
| 9 | Alidades | | M | M | M | | M |
| 9 | All-solid-state batteries | | M | | M | | |
| 9 | Altimeters | | M | M | M | | M |
| 9 | Ammeters | | M | M | M | | M |
| 9 | Ampere-hour meters | | M | | M | | M |
| 9 | Amplifiers | | M | M | M | | M |
| 9 | Amplitude modulation tuners | | M | | M | | M |
| 9 | Analog-to-digital converters | | V | | M | | M |
| 9 | Analogue to digital converters | | M | | M | | V |