http://dewey.info/scheme/edition/e23/ en
621.8 Machine engineering
621.81 General topics of machine engineering
621.811 Physical principles 621.812 Power and speed control devices 621.815 Machine design 621.816 Maintenance and repair
http://dewey.info/scheme/edition/e22/ de
621.8 Maschinenbau
621.81 Allgemeine Themen im Maschinenbau
621.811 Physikalische Prinzipien 621.812 Leistungs- und Drehzahlregler 621.815 Maschinendesign 621.816 Instandhaltung und Reparatur
Dewey Decimal Classification
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