en
62 Engineering
621 Applied physics
621.04 Special topics of applied physics 621.092 Mechanical engineers 621.1 Steam engineering 621.2 Hydraulic-power technology 621.3 Electrical, magnetic, optical, communications, computer engineering; electronics, lighting 621.4 Prime movers and heat engineering 621.5 Pneumatic, vacuum, low-temperature technologies 621.6 Blowers, fans, pumps 621.8 Machine engineering 621.9 Tools
Dewey Decimal Classification
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