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Melvil Decimal System: 621.3815028

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

Dewmoji: πŸ’‘ > πŸ”© > 🏭 > ? > ? > ? > ? > ? > ? > ?

0
Information
179,064
ℹ️
1
Philosophy and Psychology
167,145
πŸ’­
2
Religion
436,901
πŸ™πŸ½
3
Social Sciences
912,661
πŸ‘«
4
Language
121,346
πŸ’¬
5
Mathematics and Science
288,882
πŸ”¬
6
Technology
666,318
πŸ’‘
7
Arts and Recreation
658,667
🎨
8
Literature
877,170
πŸ“š
9
Biography and History
559,529
πŸ—Ώ
60
General Technology
6,468
πŸ’‘
61
Medicine
220,255
πŸ’‰
62
Engineering
108,000
πŸ”©
63
Agriculture & Animal Husbandry
63,113
🌱
64
Home Economics
124,120
🏠
65
Business
103,596
πŸ‘”
66
Chemical Technology
12,610
πŸš€
67
Manufacturing
5,230
πŸ“¦
68
Handicraft and Occupations
14,444
πŸ”¨
69
Building
8,482
πŸ‘·
620
Engineering
13,479
πŸ”©
621
Mechanical Engineering and Machinery
33,222
🏭
622
Mining Engineering and Mines and Mineral Resources
2,467
πŸ•³
623
Military Engineering and Marine Engineering
10,993
βš“
624
Civil Engineering
5,853
πŸŒ‰
625
Road and Railroad
3,488
πŸ›€
626
--
29
🀷
627
Hydraulic Engineering
1,174
🌊
628
Sanitary; Municipal
5,029
🚽
629
Other Branches
32,266
🌿
621.0
595
621.1
Steam engineering
395
621.2
Hydraulic machinery
179
621.3
Electric engineering
23,305
621.4
Heat engineering
2,518
621.5
Pneumatic machinery and Compressed air and Refrigeration and refrigerating machinery
308
621.6
Fans (Machinery) and Pumping machinery
104
621.7
Production engineering and Factories and Machine-shop practice
86
621.8
Other mechanical engineering topics
1,859
621.9
Machine-tools
897
621.30
377
621.31
3,137
621.32
277
621.33
24
621.34
83
621.35
24
621.36
2,025
621.37
90
621.38
Electronics, Communications.
14,336
621.39
Computers
1,869
621.380
Light current engineering
223
621.381
Electronics
6,239
621.382
Communications
2,875
621.383
Telegrapy
22
621.384
Radar, Radio.
2,603
621.385
Telephony
259
621.386
Telephone terminal equipment
56
621.387
Telephone transmission equipment
21
621.388
Television
612
621.389
Audio, sound engineering
785
621.3810
325
621.3811
6
621.3812
1
621.3813
225
621.3814
2
621.3815
3,031
621.3816
3
621.3817
179
621.3818
12
621.3819
406
621.38150
48
621.38151
41
621.38152
573
621.38153
414
621.38154
166
621.38155621.38156
1
621.38157621.38158621.38159
14
621.381500621.381501
15
621.381502
25
621.381503
1
621.381504621.381505621.381506
2
621.381507
5
621.381508621.381509
621.3815020621.3815021621.3815022
1
621.3815023621.3815024
1
621.3815025621.3815026621.3815027621.3815028
23
621.3815029
621.38150280621.38150281621.38150282621.38150283621.38150284621.38150285
14
621.38150286
2
621.38150287
2
621.38150288
1
621.38150289

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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