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Melvil Decimal System: 621.384151

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

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

0
Information
183,829
ℹ️
1
Philosophy and Psychology
172,351
πŸ’­
2
Religion
443,755
πŸ™πŸ½
3
Social Sciences
952,115
πŸ‘«
4
Language
123,707
πŸ’¬
5
Mathematics and Science
297,296
πŸ”¬
6
Technology
692,375
πŸ’‘
7
Arts and Recreation
669,452
🎨
8
Literature
891,726
πŸ“š
9
Biography and History
567,666
πŸ—Ώ
60
General Technology
6,663
πŸ’‘
61
Medicine
229,772
πŸ’‰
62
Engineering
113,470
πŸ”©
63
Agriculture & Animal Husbandry
64,632
🌱
64
Home Economics
125,409
🏠
65
Business
109,750
πŸ‘”
66
Chemical Technology
13,629
πŸš€
67
Manufacturing
5,473
πŸ“¦
68
Handicraft and Occupations
14,823
πŸ”¨
69
Building
8,754
πŸ‘·
620
Engineering
15,072
πŸ”©
621
Mechanical Engineering and Machinery
35,206
🏭
622
Mining Engineering and Mines and Mineral Resources
2,557
πŸ•³
623
Military Engineering and Marine Engineering
11,179
βš“
624
Civil Engineering
6,203
πŸŒ‰
625
Road and Railroad
3,572
πŸ›€
626
--
29
🀷
627
Hydraulic Engineering
1,236
🌊
628
Sanitary; Municipal
5,391
🚽
629
Other Branches
33,025
🌿
621.0
704
621.1
Steam engineering
412
621.2
Hydraulic machinery
190
621.3
Electric engineering
24,694
621.4
Heat engineering
2,758
621.5
Pneumatic machinery and Compressed air and Refrigeration and refrigerating machinery
322
621.6
Fans (Machinery) and Pumping machinery
109
621.7
Production engineering and Factories and Machine-shop practice
89
621.8
Other mechanical engineering topics
1,946
621.9
Machine-tools
957
621.30
397
621.31
3,470
621.32
283
621.33
26
621.34
96
621.35
26
621.36
2,231
621.37
95
621.38
Electronics, Communications.
15,048
621.39
Computers
1,931
621.380
Light current engineering
236
621.381
Electronics
6,583
621.382
Communications
3,046
621.383
Telegrapy
22
621.384
Radar, Radio.
2,738
621.385
Telephony
263
621.386
Telephone terminal equipment
57
621.387
Telephone transmission equipment
21
621.388
Television
624
621.389
Audio, sound engineering
814
621.3840
91
621.3841
Amateur radio
1,060
621.3842
15
621.3843
4
621.3844
1
621.3845
613
621.3846
4
621.3847621.3848
Radar
267
621.3849
621.38410
12
621.38411
63
621.38412
64
621.38413
174
621.38414621.38415
62
621.38416
174
621.38417
6
621.38418
61
621.38419
96
621.384150621.384151
34
621.384152
10
621.384153
1
621.384154
2
621.384155621.384156
8
621.384157621.384158621.384159

Works under MDS 621.384151

1–31 of 31 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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