Table:
text: 1971 Spanish Grand Prix
Classification
Classification
Driver Constructor_ Laps Time_Retired Grid
Emerson Fittipaldi Lotus - Ford 54 Suspension 14
Henri Pescarolo March - Ford 53 Engine 11
Mario Andretti Ferrari 50 Engine 8
Alex Soler-Roig March - Ford 46 Fuel Pump 20
Andrea de Adamich March - Alfa Romeo 26 Transmission 18
Ronnie Peterson March - Ford 24 Ignition 13
Clay Regazzoni Ferrari 13 Engine 2
Rolf Stommelen Surtees - Ford 9 Fuel Pressure 19
Jo Siffert BRM 5 Gearbox 15
Graham Hill Brabham - Ford 5 Steering 10

Question: Who built the car that has a retired engine and completed 50 laps at the 1971 Spanish Grand Prix?