Reliance-Mercury
of Halifax, maker of tugs for ground-handling of aircraft.
Subsidiary of Marshalls (Halifax)
At some point presumably Marshalls acquired Reliance (Trucks) of Heckmondwicke.
1972 Marshalls (Halifax) was a maker of aircraft ground support and airfield tractors; it acquired Mercury Truck and Tractor and Mercury Airfield Equipment businesses from the Hestair Group[1]
1976 Reliance Mercury exhibited a range of vehicles for airport use including the RM 3000 tug powered by a British Leyland engine for operation on petrol or LPG.[2]
1984 Employed electronic controller designed and made by Sloan Power Electronics of Gateshead in its electric tractors[3]
1987 Marshalls sold Reliance-Mercury
By 1992 was part of Trinity Holdings[4], later renamed Dennis Group