The present invention provides an Al2O3 coated Si3N4 cutting tool comprising a Si3N4 based substrate body and a coating layer on the substrate body, wherein the coating layer has at least one Al2O3 coating layer consisting of amorphous Al2O3 or nanocrystalline \u03b1-, \u03b3-, or \u03ba-Al2O3. The patient support includes a release mechanism configured to move a portion of the patient support from a raised position to a lowered position. The aim of the invention is improving the windshield wiper device so that it can be mounted on the vehicle body more quickly and therefore more cost-effectively. The method may further determine relative distances between the terms in the document that match the search criteria according to the standard deviation. The join key is written to the wireless field device with the handheld field maintenance tool.