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Melvil Decimal System: 621.38154

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

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

0
Information
196,271
ℹī¸
1
Philosophy and Psychology
182,817
💭
2
Religion
463,618
🙏đŸŊ
3
Social Sciences
1,017,722
đŸ‘Ģ
4
Language
130,463
đŸ’Ŧ
5
Mathematics and Science
322,970
đŸ”Ŧ
6
Technology
751,858
💡
7
Arts and Recreation
695,836
🎨
8
Literature
929,792
📚
9
Biography and History
592,368
đŸ—ŋ
60
General Technology
6,985
💡
61
Medicine
251,982
💉
62
Engineering, contracts
128,146
🔩
63
Agriculture & Animal Husbandry
68,016
🌱
64
Home Economics
130,045
🏠
65
Business
119,888
👔
66
Chemical Technology
15,663
🚀
67
Manufacturing
6,358
đŸ“Ļ
68
Handicraft and Occupations
15,511
🔨
69
Building
9,264
👷
620
Engineering
18,961
🔩
621
Mechanical Engineering and Machinery
40,539
🏭
622
Mining Engineering and Mines and Mineral Resources
2,834
đŸ•ŗ
623
Military Engineering and Marine Engineering
11,904
⚓
624
Civil Engineering
7,081
🌉
625
Road and Railroad
3,892
🛤
626
--
37
🤷
627
Hydraulic Engineering
1,379
🌊
628
Sanitary; Municipal
6,166
đŸšŊ
629
Other Branches
35,353
đŸŒŋ
621.0
1,010
621.1
Steam engineering
504
621.2
Hydraulic machinery
203
621.3
Electric engineering
28,314
621.4
Heat engineering
3,312
621.5
Pneumatic machinery and Compressed air and Refrigeration and refrigerating machinery
375
621.6
Fans (Machinery) and Pumping machinery
139
621.7
Production engineering and Factories and Machine-shop practice
129
621.8
Other mechanical engineering topics
2,179
621.9
Machine-tools
1,070
621.30
420
621.31
4,008
621.32
296
621.33
30
621.34
104
621.35
27
621.36
2,576
621.37
108
621.38
Electronics, Communications.
17,177
621.39
Computers
2,162
621.380
Light current engineering
262
621.381
Electronics
7,713
621.382
Communications
3,698
621.383
Telegrapy
24
621.384
Radar, Radio.
2,928
621.385
Telephony
268
621.386
Telephone terminal equipment
58
621.387
Telephone transmission equipment
21
621.388
Television
654
621.389
Audio, sound engineering
872
621.3810
381
621.3811
7
621.3812
1
621.3813
283
621.3814
5
621.3815
3,933
621.3816
3
621.3817
202
621.3818
12
621.3819
424
621.38150
55
621.38151
43
621.38152
798
621.38153
460
621.38154
193
621.38155621.38156
2
621.38157621.38158621.38159
13
621.381540
2
621.381541621.381542
68
621.381543621.381544621.381545621.381546621.381547621.381548
96
621.381549

Works under MDS 621.38154

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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

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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