Methods of forming contact openings, making electrical interconnections, and related integrated circuitry are described. Methods for producing and use of the invention ODPCs or the cell culture enriched with these ODPCs for stem cell therapy are also provided. The computer portion 70 adds the first ancillary reaction force RF1 to the main reaction force RF0 to obtain a composite reaction force to control a solenoid 21 on the basis of the composite reaction force so that a reaction force which is to be exerted on the key 11 will be the composite reaction force.