| Invention or discovery | Inventor or discoverer | Type |
|---|---|---|
| Electromechanical organ | Laurens Hammond | — |
| Hammond organ | Laurens Hammond | musical instrument model |
| T. A. Boor traffic light | T. A. Boor | traffic light |
| Invention or discovery | Inventor or discoverer | Type |
|---|---|---|
| Electromechanical organ | Laurens Hammond | — |
| Hammond organ | Laurens Hammond | musical instrument model |
| T. A. Boor traffic light | T. A. Boor | traffic light |