Shared PDF covering the 2N4400 and 2N4401, 48.6 KB, sorted into the schematic category but most likely a combined manufacturer datasheet. Having both grades in one document makes it easy to compare gain ranges and limits when deciding on a substitute. Technicians open it in a PDF reader to confirm pinout and absolute maximum ratings before soldering. Verify that the package drawing and lead order match the component on the board before relying on them.
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)