| 2191 | Acoustical Enclosures | Company Product |
| 2192 | Acoustical Control Structures & Equipment | Company Product |
| 2193 | Acoustical Consultants | Company Product |
| 2194 | Acetylene Gas Distributors | Company Product |
| 2195 | Acetone | Company Product |
| 2196 | Acetylene Gas Manufacturers | Company Product |
| 2197 | Accountants | Company Product |
| 2198 | Accounting & Bookkeeping Machines | Company Product |
| 2199 | Access Control Systems | Company Product |
| 2200 | AC Generators | Company Product |
| 2201 | AC Electric Motors | Company Product |
| 2202 | AC Line Voltage Conditioners | Company Product |
| 2203 | AC Adaptors | Company Product |
| 2204 | Abrasives | Company Product |
| 2205 | Abrasive Cutting Wheels | Company Product |
| 2206 | Abrasive Grinding Wheels | Company Product |