A coated glass fiber for reinforcing a rubber includes a glass fiber, a first coating layer covering the glass fiber, and a second coating layer covering the first coating layer. The data change request priority scheme can entail encoding sequence number information and dependency information in the data change requests, responsive to which data changes can be made, unmade and remade to the data. The alignment layer is disposed in an alignment region which overlaps an entire of the active region and extends further than the active region. At least part of the first area is outside the second area. To even further enhance the overall renewability of the layer, a relatively high amount of the biodegradable polymers are starch polymers, which are also renewable. The guide mechanism includes dispensing and collecting rollers for installing at least one first stratum between the mattress and the occupant of the service bed and for removing at least one second stratum installed between the mattress and the occupant.