PDF datasheet for the 2SA1338, a part whose 2SA prefix marks it as a PNP transistor intended for high-frequency service under the Japanese JIS convention. The 155 KB file is catalogued as a schematic but should be treated as component reference material. Look here for lead identification, case outline, voltage and current limits and gain classifications. Repair work typically relies on such data to test the junctions out of circuit, interpret readings correctly and pick a compatible substitute with equal or better 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.
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The standard format for schematics, block diagrams, power-sequence charts and service manuals.