PDF reference on the 2SC4517 transistor, the name noting it as NPN; the file is 26.9 KB and indexed as a schematic. Typical content for such a sheet is absolute maximum ratings, electrical characteristics, package drawing and pin identification. A repair technician uses it to confirm which lead is base, collector and emitter, test junctions with a diode-mode meter and judge whether a proposed replacement can handle the same voltage and current. Opens in any PDF reader; verify package and marking on the actual part.
The button opens the matching file on RM Schematics, or a source page if it is not catalogued there yet. The original attachment is from @cyberlanelectonik. Enginerys does not host this file.
How to open a .pdf file
The standard format for schematics, block diagrams, power-sequence charts and service manuals.