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Melvil Decimal System: 621.3893

Wording: Technology > Engineering > Mechanical Engineering and Machinery > Electric engineering > Electronics, Communications. > Audio, sound engineering > Not set

Dewmoji: 💡 > 🔩 > 🏭 > ? > ? > ? > ?

0
Information
195,291
ℹī¸
1
Philosophy and Psychology
181,886
💭
2
Religion
459,268
🙏đŸŊ
3
Social Sciences
1,012,288
đŸ‘Ģ
4
Language
129,832
đŸ’Ŧ
5
Mathematics and Science
321,836
đŸ”Ŧ
6
Technology
748,891
💡
7
Arts and Recreation
692,253
🎨
8
Literature
923,945
📚
9
Biography and History
588,112
đŸ—ŋ
60
General Technology
6,938
💡
61
Medicine
250,925
💉
62
Engineering
127,505
🔩
63
Agriculture & Animal Husbandry
67,830
🌱
64
Home Economics
129,551
🏠
65
Business
119,608
👔
66
Chemical Technology
15,558
🚀
67
Manufacturing
6,322
đŸ“Ļ
68
Handicraft and Occupations
15,431
🔨
69
Building
9,223
👷
620
Engineering
18,920
🔩
621
Mechanical Engineering and Machinery
40,346
🏭
622
Mining Engineering and Mines and Mineral Resources
2,779
đŸ•ŗ
623
Military Engineering and Marine Engineering
11,846
⚓
624
Civil Engineering
7,059
🌉
625
Road and Railroad
3,741
🛤
626
--
34
🤷
627
Hydraulic Engineering
1,366
🌊
628
Sanitary; Municipal
6,154
đŸšŊ
629
Other Branches
35,260
đŸŒŋ
621.0
1,007
621.1
Steam engineering
477
621.2
Hydraulic machinery
204
621.3
Electric engineering
28,262
621.4
Heat engineering
3,291
621.5
Pneumatic machinery and Compressed air and Refrigeration and refrigerating machinery
362
621.6
Fans (Machinery) and Pumping machinery
130
621.7
Production engineering and Factories and Machine-shop practice
126
621.8
Other mechanical engineering topics
2,175
621.9
Machine-tools
1,057
621.30
417
621.31
4,005
621.32
297
621.33
30
621.34
104
621.35
27
621.36
2,575
621.37
108
621.38
Electronics, Communications.
17,138
621.39
Computers
2,159
621.380
Light current engineering
261
621.381
Electronics
7,702
621.382
Communications
3,687
621.383
Telegrapy
24
621.384
Radar, Radio.
2,919
621.385
Telephony
268
621.386
Telephone terminal equipment
58
621.387
Telephone transmission equipment
21
621.388
Television
652
621.389
Audio, sound engineering
868
621.3890621.3891621.3892
100
621.3893
415
621.3894621.3895
7
621.3896
1
621.3897
24
621.3898621.3899
1
621.38930
35
621.38931621.38932
80
621.38933
51
621.38934621.38935621.38936621.38937621.38938621.38939

Works under MDS 621.3893

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Wording

1922 Edition
Modern language
Emoji

"Far Friends"

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

None

Related tags

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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