In certain embodiments, a service provided by a production server is facilitated. A grate subsystem contains the fuel and includes at least one grinding mechanism. The engine parameters may comprise at least an engine inlet temperature and an exhaust temperature. A polysilicon layer pattern is formed in the contact hole. The housing is formed with a pin hole extending substantially perpendicular to an axis of the cylinder chamber near the front end of the housing and under the cylinder chamber. There is a provision such that the operating device includes at least two mutually parallel plungers, which on operation act on second different flanks of the valve member, operation of one plunger locking the respectively other plunger.