These clamps were invented by Egil E Hyggen in 1968, for which he was awarded a major design prize in Norway. According to the company which manufactured them, Christiana Spigerverk, they ended production in the mid 1980s but were available in many countries for much longer.This item is significant because it shows how snow driving safety has evolved over time.A set of Norwegian manufactured wheel clamps for safe driving in snow and icy conditions. They are displayed with a poster explaining application.wheel clamps, snow driving safety, snow grips, snow chains and safety 1970s