Générale de Mécanique et de Thermique, known by the initials GMT, was a manufacturer based in Wingles, in the Nord-Pas de Calais region of France. The company was known for the Rivelaine, a microcar built as a four-wheeled, two-seater vehicle. It was distinguished by a long, sloping tail design and featured winding windows, a detail considered a luxury for a vehicle of its class. The Rivelaine was initially presented with…