Small 27.6 KB PDF for the 2N7051, filed as a schematic but by its name a datasheet for one discrete semiconductor. Such a short file is probably a brief sheet of a few pages, and the name states no maker or revision. It can be opened in any PDF viewer. Use it to look up lead assignment and absolute maximum values when replacing a failed device, and compare the package drawing and markings with the original part before installing a substitute on the PCB.
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.
Any PDF readerSumatraPDFFirefox / ChromeFlexBV (links PDF to boardview)