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Melvil Decimal System: 621.38412

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

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

0
Information
195,741
ℹ️
1
Philosophy and Psychology
182,263
πŸ’­
2
Religion
460,825
πŸ™πŸ½
3
Social Sciences
1,014,164
πŸ‘«
4
Language
129,985
πŸ’¬
5
Mathematics and Science
322,242
πŸ”¬
6
Technology
750,552
πŸ’‘
7
Arts and Recreation
693,368
🎨
8
Literature
925,888
πŸ“š
9
Biography and History
589,703
πŸ—Ώ
60
General Technology
6,960
πŸ’‘
61
Medicine
251,523
πŸ’‰
62
Engineering
127,961
πŸ”©
63
Agriculture & Animal Husbandry
67,901
🌱
64
Home Economics
129,775
🏠
65
Business
119,737
πŸ‘”
66
Chemical Technology
15,639
πŸš€
67
Manufacturing
6,347
πŸ“¦
68
Handicraft and Occupations
15,463
πŸ”¨
69
Building
9,246
πŸ‘·
620
Engineering
18,945
πŸ”©
621
Mechanical Engineering and Machinery
40,517
🏭
622
Mining Engineering and Mines and Mineral Resources
2,830
πŸ•³
623
Military Engineering and Marine Engineering
11,874
βš“
624
Civil Engineering
7,073
πŸŒ‰
625
Road and Railroad
3,860
πŸ›€
626
--
35
🀷
627
Hydraulic Engineering
1,374
🌊
628
Sanitary; Municipal
6,162
🚽
629
Other Branches
35,291
🌿
621.0
1,009
621.1
Steam engineering
504
621.2
Hydraulic machinery
203
621.3
Electric engineering
28,297
621.4
Heat engineering
3,310
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
2,177
621.9
Machine-tools
1,072
621.30
420
621.31
4,005
621.32
296
621.33
30
621.34
104
621.35
27
621.36
2,575
621.37
108
621.38
Electronics, Communications.
17,166
621.39
Computers
2,160
621.380
Light current engineering
262
621.381
Electronics
7,710
621.382
Communications
3,696
621.383
Telegrapy
24
621.384
Radar, Radio.
2,927
621.385
Telephony
267
621.386
Telephone terminal equipment
58
621.387
Telephone transmission equipment
21
621.388
Television
652
621.389
Audio, sound engineering
871
621.3840
95
621.3841
Amateur radio
1,118
621.3842
14
621.3843
4
621.3844
1
621.3845
673
621.3846
4
621.3847621.3848
Radar
287
621.3849
1
621.38410
12
621.38411
65
621.38412
65
621.38413
180
621.38414621.38415
62
621.38416
179
621.38417
7
621.38418
64
621.38419
108
621.384120
2
621.384121621.384122621.384123621.384124621.384125621.384126621.384127621.384128621.384129

Works under MDS 621.38412

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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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