Another copy of the BUW84 and BUW85 NPN power transistor sheet, judging by the duplicate-style suffix in the name and the identical 101 KB size. Catalogued as a schematic, it is really a component datasheet with voltage and current ratings, gain, switching times and pinout. The contents should match the other BUW84/BUW85 entries, so any one of them serves the same purpose: identifying pins for testing and selecting replacements in high-voltage switching circuits. Confirm the exact part number printed on the transistor before substituting.
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.