| Year | 1919 |
| Date | 28-Aug |
| Volume | 41 |
| Issue | 957 |
| Page | 211 |
| Category | Automotive |
| Part | |
| Title | Electric Horns for Motor Cars |
| Author | "Calculus" |
| Notes | Operating on the buzzer principle, internal mechanism of buzzer horn, with reciprocating plunger, of a motor operated horn, Klaxon |