sm – sevice manual in English , smR – service manual in Russian, smD – service manual in Deutch, sh – service handbook in English, tr – training manual, rm – reference manual, pc – part catalogue / parts list in English, cd / sd – circuit diagram / schematic diagram, sb – service bulletin, drv – driver, fw – firmware, um – user manual English, umR – user manual in Russian, ug – user / owner guide, inst – installation procedure in English.