Seventeenth-century mentor spring in Lisbon Carriage Museum The earliest known leaf springs started appearing on carriages in France during the mid-17th century in the shape of the two-section elbow spring (given that the illustrated instance from Lisbon), and later on migrated to England and Germany,[six] showing up over the carriages https://engineeringvariablefreque10752.wssblogs.com/35360570/trailer-jack-secrets