At 235 KB this PDF for 2SC4439 is one of the more detailed files in the set, likely carrying graphs as well as rating tables. Although listed as a schematic, the JIS-style 2SC prefix, meaning an NPN bipolar transistor for high-frequency applications, suggests a datasheet. The name states nothing further. Use it to confirm pin functions, package size and absolute limits, and to compare characteristic curves when picking an equivalent part for a repair.
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)