PDF document of 42.9 KB for the 2N6059 discrete semiconductor, labelled a schematic in the index though it is probably a datasheet. Beyond the JEDEC part number the name offers no information. Sheets in the 2N series usually set out terminal assignment, package dimensions, voltage and current limits, and gain or switching data. Use it to confirm which lead is which before measuring or desoldering, and check that any substitute meets or exceeds the listed ratings.
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.