17th-century mentor spring in Lisbon Carriage Museum The earliest regarded leaf springs started appearing on carriages in France during the mid-17th century in the shape of the two-section elbow spring (since the illustrated instance from Lisbon), and later on migrated to England and Germany,[six] showing up to the carriages of https://emilianoitenv.blogrelation.com/41738345/an-unbiased-view-of-trailer-jack