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 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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