But we have seen that contract protection is not only afforded by these formal regulations but also by judicial rulings on special cases. These latter have a threefold task: to prevent the drawing up of unfair contracts, to supply deficiencies in the contract, by adding subsidiary rulings suited to the nature of the industrial service relations, and lastly, to secure the fulfilment of service contract; _i.e._ they have to provide protection by limitation and completion of contract and to secure fulfilment of contract. This kind of protection of contract is of special importance in dealing with contract fines, proportional output ("efficiency work"), the supply of tools and materials of work, and lastly with payment of wage. Labour Protection seeks to guard against abuse of contract fines, by fixing the highest permissible amount of fines, and by handing over the proceeds of the fines to the workmen's provident fund. This is a matter of the highest moment, and must find a place in the drawing up and in the enforcement of the working rules (see above). Hitherto it has only been extended to factory labour. A second task of protection of contract lies in the protection of "efficiency work," _i.e._ protection of the wage-worker against an undue deduction from his "efficiency wage" on account of the alleged inferior quality of the output, and against neglect to reckon in the full amount of the output in the calculation of wage. This measure of protection has been placed on the orders of the day of the present labour protective movement, by the adoption _e.g._ of the system of checking the weight of the output in mining. In the third place we come to protection of the workman against loss sustained in buying his tools and materials of work from the employer. This measure of protection in purchase of materials is applied to the whole of industrial labour by means of its insertion in the general rules for truck protection contained in the Imp. Ind. Code.