1924

The birth of the famous “Du-Da-Do” three-tone horn.

The birth of the famous “Du-Da-Do” three-tone horn.

The three-tone horn can be heard on mountainous postal routes. Its purpose is to warn other road users at blind spots on narrow roads. The “C-sharp - E - A” tone sequence is based on the overture to Gioachino Rossini’s “William Tell”.