"A wide range of other persons may incur responsibility where injury or damage is caused through contact with a defective product. In Haseldine v. Daw & Son Ltd for example, a firm of engineers was held liable for negligence in repairing a hydraulic lift which fell, injuring a visitor in a block of flats. A representative selection of other modern cases has involved negligence in repairing the steering of a motor car and a fork lift truck; reconditioning a motor car; repairing and reassembling the wheel of a lorry; fitting a sidecar to a motorcycle; a valve to a ships boiler and an outlet pipe to discharge gasses from a boiler; and in installing an electric meter in a factory, a gas heating system in a house and a juke box in a restaurant. The negligence in such cases may take a variety of forms. For example a source of danger may have been created in a positive sense, as through mis-assembly, or the defendant may have failed to remedy a defect where this was reasonably to be expected."