Reliance Trucks Ltd., of Spen Vale Works, Heckmondwicke, Yorks.
1935 "WELL-KNOWN as the maker of a comprehensive range of small industrial trucks.and tractors, Reliance Trucks, Ltd., Vale Works, Heckmondwike, Yorkshire, has just introduced a new and larger model, differing considerably in general design from the earlier types."[1]
Named the Bulldog, The new machine was called the Bulldog'l it was a three-wheeled tractor of 12-24 h.p. "Unlike previous Reliance machines, the engine, transmission and front wheel are not built as a self-contained swivelling unit, but the engine is installed in the frame in a more conventional manner, driving the rear axle through a unit constructed gearbox."
1936 Article described a 3-wheeled Factory Tractor.
1944 Listed as one of the makers of works trucks[2]
1949 A range of tractors, trucks and trailers for internal transport were shown at the British Industries Fair by Reliance Trucks[3]
1960 With Geoffrey Wilson Marshall of Halifax, applied for a patent on "improvements in mechanically-propelled vehicles (granted in 1964). Concerned material handing trucks for use over short distances in buildings driven by a hydraulic motor.
At some point Marshalls (Halifax) presumably combined Reliance with Mercury Truck and Tractor Co to form Reliance-Mercury