| Country | Name | Made | Factoids |
|---|---|---|---|
| K.W. Systems | 4 | ||
| Kalon Radio Corporation | 1 | ||
| Kasco | 1 | ||
| Kasha & Son Ltd. | 1 | ||
| Kaufmann Frères | 1 | ||
| Keeney & Co., Inc. , J. H. | 121 | ||
| Keeney and Sons, Inc. | 12 | ||
| Keith Newstead | 1 | ||
| Keith Prowse & Co. | 2 | ||
| Kett, A. R. | 1 | ||
| Klein & Co,, Henry | 1 | ||
| Klein & Co., H. | 1 | ||
| Kraft's Automatics Ltd. | 21 |
Code updated 20th Feb 2024