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Melvil Decimal System: 621.384193

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

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

0
Information
195,847
ℹī¸
1
Philosophy and Psychology
182,359
💭
2
Religion
461,225
🙏đŸŊ
3
Social Sciences
1,014,630
đŸ‘Ģ
4
Language
130,032
đŸ’Ŧ
5
Mathematics and Science
322,345
đŸ”Ŧ
6
Technology
750,672
💡
7
Arts and Recreation
693,655
🎨
8
Literature
926,238
📚
9
Biography and History
589,954
đŸ—ŋ
60
General Technology
6,966
💡
61
Medicine
251,558
💉
62
Engineering
127,975
🔩
63
Agriculture & Animal Husbandry
67,911
🌱
64
Home Economics
129,796
🏠
65
Business
119,761
👔
66
Chemical Technology
15,639
🚀
67
Manufacturing
6,347
đŸ“Ļ
68
Handicraft and Occupations
15,470
🔨
69
Building
9,249
👷
620
Engineering
18,945
🔩
621
Mechanical Engineering and Machinery
40,518
🏭
622
Mining Engineering and Mines and Mineral Resources
2,830
đŸ•ŗ
623
Military Engineering and Marine Engineering
11,875
⚓
624
Civil Engineering
7,074
🌉
625
Road and Railroad
3,860
🛤
626
--
35
🤷
627
Hydraulic Engineering
1,377
🌊
628
Sanitary; Municipal
6,162
đŸšŊ
629
Other Branches
35,299
đŸŒŋ
621.0
1,009
621.1
Steam engineering
504
621.2
Hydraulic machinery
203
621.3
Electric engineering
28,298
621.4
Heat engineering
3,311
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
1,071
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.
17,167
621.39
Computers
2,160
621.380
Light current engineering
262
621.381
Electronics
7,711
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
621.384190621.384191
20
621.384192
29
621.384193
48
621.384194621.384195621.384196
5
621.384197
1
621.384198
2
621.384199
621.3841930
12
621.3841931621.3841932621.3841933621.3841934621.3841935621.3841936621.3841937621.3841938
2
621.3841939

Works under MDS 621.384193

1–47 of 47 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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