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of Halifax, maker of tugs for ground-handling of aircraft.
Subsidiary of Marshalls (Halifax)
At some point presumably Marshalls acquired Reliance (Trucks) of Heckmondwicke.
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.
1987 Marshalls sold Reliance-Mercury