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Melvil Decimal System: 621.3126

Wording: Technology > Engineering > Mechanical Engineering and Machinery > Electric engineering > Not set > Not set > Not set

Dewmoji: 💡 > 🔩 > 🏭 > ? > ? > ? > ?

0
Information
103,636
ℹī¸
1
Philosophy and Psychology
103,714
💭
2
Religion
294,496
🙏đŸŊ
3
Social Sciences
493,497
đŸ‘Ģ
4
Language
65,892
đŸ’Ŧ
5
Mathematics and Science
161,910
đŸ”Ŧ
6
Technology
380,220
💡
7
Arts and Recreation
400,026
🎨
8
Literature
545,362
📚
9
Biography and History
351,584
🔙
60
General Technology
4,277
💡
61
Medicine
120,783
💉
62
Engineering
55,711
🔩
63
Agriculture & Animal Husbandry
38,347
🌱
64
Home Economics
82,481
🏠
65
Business
55,114
👔
66
Chemical Technology
6,574
🚀
67
Manufacturing
2,825
đŸ“Ļ
68
Handicraft and Occupations
9,253
🔨
69
Building
4,855
👷
620
Engineering
5,874
🔩
621
Mechanical Engineering and Machinery
17,295
🏭
622
Mining Engineering and Mines and Mineral Resources
1,221
đŸ•ŗ
623
Military Engineering and Marine Engineering
6,445
⚓
624
Civil Engineering
2,709
🌉
625
Road and Railroad
1,834
🛤
626
--
17
🤷
627
Hydraulic Engineering
567
🌊
628
Sanitary; Municipal
2,366
đŸšŊ
629
Other Branches
17,383
đŸŒŋ
621.0
235
621.1
Steam engineering
210
621.2
Hydraulic machinery
83
621.3
Electric engineering
11,423
621.4
Heat engineering
1,103
621.5
Pneumatic machinery and Compressed air and Refrigeration and refrigerating machinery
154
621.6
Fans (Machinery) and Pumping machinery
55
621.7
Production engineering and Factories and Machine-shop practice
57
621.8
Other mechanical engineering topics
847
621.9
Machine-tools
465
621.30
248
621.31
1,428
621.32
147
621.33
12
621.34
49
621.35
10
621.36
766
621.37
50
621.38
Electronics, Communications.
7,332
621.39
Computers
908
621.310
85
621.311
2
621.312
244
621.313
59
621.314
23
621.315
2
621.316
6
621.317
113
621.318
1
621.319
655
621.3120
1
621.3121
102
621.3122621.3123621.3124
115
621.3125621.3126
5
621.3127621.3128621.3129
621.31260
1
621.31261621.31262621.31263621.31264621.31265621.31266621.31267621.31268621.31269

Wording

1922 Edition
Modern language
Emoji

"Far Friends"

MDS classes with significant recommendations overlap, excluding ones under the same top-level class.

None

What is MDS?

Melvil stands for "Melvil Decimal System," named after Melvil Dewey, the famous librarian. Melvil Dewey invented his Dewey Decimal System in 1876, and early versions of his system are in the public domain.

More recent editions of his system are in copyright, and the name "Dewey," "Dewey Decimal," "Dewey Decimal Classification" and "DDC" are registered trademarked by OCLC, who publish periodic revisions.

LibraryThing's MDS system is based on the classification work of libraries around the world, whose assignments are not copyrightable. MDS "scheduldes" (the words that describe the numbers) are user-added, and based on public domain editions of the system.

The Melvil Decimal System is NOT the Dewey Decimal System of today. Wordings, which are entered by members, can only come from public domain sources. The base system is the Free Decimal System, a public domain classification created by John Mark Ockerbloom. Where useful or necessary, wording comes from the 1922 edition of the Dewey Decimal System. Language and concepts may be changed to fit modern tastes, or to better describe books cataloged. Wordings may not come from in-copyright sources.

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