Turbine blades, including airfoils, of aviation or industrial gas turbine engines are treated with boron to improve surface hardness andor durability. A liquid material delivering method wherein a liquid material is pressurized by a plunger sliding while closely contacting an inner wall surface of a liquid feed passageway establishing communication between a nozzle and a storage section to deliver the liquid material through the nozzle. Second data SDA2, a data sequence intended for the storage devices 22, 24, 26, 28 of the second group, is supplied via a second data signal line DL2 to the storage devices 22, 24, 26, 28 of the second group. At the distal end of needle is a slotted hook for capturing a loop of suture.