PDF covering the BUW84 and BUW85 transistors in a single 101 KB document, filed as a schematic. These are high-voltage bipolar power transistors, and the sheet should give collector-emitter ratings, gain, switching times and the pin layout. Such devices are found in older switch-mode power supplies and deflection-related circuits, so the data helps confirm base, collector and emitter before meter testing. Check which of the two numbers is fitted, as their voltage ratings differ, and a replacement must meet or exceed the original.
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.