| Query | User |
|---|---|
| half mile hailer | entered by user 8548275 |
| half-mile hailer | entered by user 8588529 |
| lectern | entered by user 5827001 |
| outdoor p a systems | entered by user 4742131 |
| outdoor speaker horns | entered by user 1597800 |
| sound systems | entered by user 14849226 |
| wireless sound systems | entered by user 14150216 |
| wireless sound systems | entered by user ditto |