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Melvil Decimal System: 621.31921

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

Dewmoji: 💡 > 🔩 > 🏭 > ? > ? > ? > ? > ?

0
Information
174,769
ℹ️
1
Philosophy and Psychology
162,176
💭
2
Religion
425,946
🙏🏽
3
Social Sciences
883,500
👫
4
Language
118,384
💬
5
Mathematics and Science
274,667
🔬
6
Technology
640,759
💡
7
Arts and Recreation
653,832
🎨
8
Literature
867,919
📚
9
Biography and History
552,874
🗿
60
General Technology
6,264
💡
61
Medicine
208,186
💉
62
Engineering
102,734
🔩
63
Agriculture & Animal Husbandry
62,059
🌱
64
Home Economics
123,322
🏠
65
Business
99,385
👔
66
Chemical Technology
11,514
🚀
67
Manufacturing
4,873
📦
68
Handicraft and Occupations
14,191
🔨
69
Building
8,231
👷
620
Engineering
12,126
🔩
621
Mechanical Engineering and Machinery
31,245
🏭
622
Mining Engineering and Mines and Mineral Resources
2,353
🕳
623
Military Engineering and Marine Engineering
10,880
⚓
624
Civil Engineering
5,413
🌉
625
Road and Railroad
3,440
🛤
626
--
29
🤷
627
Hydraulic Engineering
1,060
🌊
628
Sanitary; Municipal
4,547
🚽
629
Other Branches
31,641
🌿
621.0
536
621.1
Steam engineering
378
621.2
Hydraulic machinery
172
621.3
Electric engineering
21,859
621.4
Heat engineering
2,252
621.5
Pneumatic machinery and Compressed air and Refrigeration and refrigerating machinery
274
621.6
Fans (Machinery) and Pumping machinery
99
621.7
Production engineering and Factories and Machine-shop practice
83
621.8
Other mechanical engineering topics
1,785
621.9
Machine-tools
873
621.30
366
621.31
2,862
621.32
267
621.33
23
621.34
77
621.35
23
621.36
1,809
621.37
81
621.38
Electronics, Communications.
13,636
621.39
Computers
1,751
621.310
163
621.311
3
621.312
453
621.313
89
621.314
30
621.315
5
621.316
10
621.317
178
621.318
2
621.319
1,225
621.3190
9
621.3191
76
621.3192
542
621.3193
35
621.3194621.3195
1
621.3196621.3197621.3198
2
621.3199
621.31920
26
621.31921
38
621.31922
4
621.31923
5
621.31924
294
621.31925621.31926621.31927621.31928621.31929

Works under MDS 621.31921

1–36 of 36 titles | covers | shelf

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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