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Melvil Decimal System: 621.38133

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

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

0
Information
184,385
ℹī¸
1
Philosophy and Psychology
173,011
💭
2
Religion
444,891
🙏đŸŊ
3
Social Sciences
956,176
đŸ‘Ģ
4
Language
124,030
đŸ’Ŧ
5
Mathematics and Science
297,976
đŸ”Ŧ
6
Technology
694,518
💡
7
Arts and Recreation
670,607
🎨
8
Literature
893,417
📚
9
Biography and History
568,807
đŸ—ŋ
60
General Technology
6,677
💡
61
Medicine
230,484
💉
62
Engineering
113,881
🔩
63
Agriculture & Animal Husbandry
64,778
🌱
64
Home Economics
125,575
🏠
65
Business
110,302
👔
66
Chemical Technology
13,705
🚀
67
Manufacturing
5,492
đŸ“Ļ
68
Handicraft and Occupations
14,844
🔨
69
Building
8,780
👷
620
Engineering
15,175
🔩
621
Mechanical Engineering and Machinery
35,350
🏭
622
Mining Engineering and Mines and Mineral Resources
2,565
đŸ•ŗ
623
Military Engineering and Marine Engineering
11,192
⚓
624
Civil Engineering
6,241
🌉
625
Road and Railroad
3,577
🛤
626
--
29
🤷
627
Hydraulic Engineering
1,242
🌊
628
Sanitary; Municipal
5,415
đŸšŊ
629
Other Branches
33,095
đŸŒŋ
621.0
711
621.1
Steam engineering
417
621.2
Hydraulic machinery
191
621.3
Electric engineering
24,788
621.4
Heat engineering
2,773
621.5
Pneumatic machinery and Compressed air and Refrigeration and refrigerating machinery
325
621.6
Fans (Machinery) and Pumping machinery
110
621.7
Production engineering and Factories and Machine-shop practice
89
621.8
Other mechanical engineering topics
1,953
621.9
Machine-tools
962
621.30
403
621.31
3,494
621.32
283
621.33
26
621.34
97
621.35
26
621.36
2,237
621.37
95
621.38
Electronics, Communications.
15,094
621.39
Computers
1,940
621.380
Light current engineering
237
621.381
Electronics
6,604
621.382
Communications
3,052
621.383
Telegrapy
22
621.384
Radar, Radio.
2,750
621.385
Telephony
262
621.386
Telephone terminal equipment
57
621.387
Telephone transmission equipment
21
621.388
Television
627
621.389
Audio, sound engineering
818
621.3810
347
621.3811
6
621.3812
1
621.3813
262
621.3814
2
621.3815
3,239
621.3816
3
621.3817
188
621.3818
12
621.3819
412
621.38130
1
621.38131
11
621.38132
87
621.38133
54
621.38134621.38135621.38136621.38137
1
621.38138621.38139
621.381330621.381331
20
621.381332
3
621.381333
1
621.381334621.381335
3
621.381336
3
621.381337621.381338621.381339

Works under MDS 621.38133

1–49 of 49 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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