Systems and methods for hosting managed code controls within unmanged hosts, such as MICROSOFT Word and Excel. In one embodiment, a signal is injected into the switch fabric of the switch via a demultiplexing device. Under a driving condition, one of an internal tooth body of the internally toothed gear wheel and an external tooth body of the externally toothed gear wheel is elastically deformed in an extending direction and the other thereof is elastically deformed in a contracting direction so that the number of meshing teeth becomes larger than the number of meshing teeth under a non-driving condition.