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Melvil Decimal System: 621.384132

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

Dewmoji: ๐Ÿ’ก > ๐Ÿ”ฉ > ๐Ÿญ > ? > ? > ? > ? > ? > ?

0
Information
183,829
โ„น๏ธ
1
Philosophy and Psychology
172,351
๐Ÿ’ญ
2
Religion
443,755
๐Ÿ™๐Ÿฝ
3
Social Sciences
952,115
๐Ÿ‘ซ
4
Language
123,707
๐Ÿ’ฌ
5
Mathematics and Science
297,296
๐Ÿ”ฌ
6
Technology
692,375
๐Ÿ’ก
7
Arts and Recreation
669,452
๐ŸŽจ
8
Literature
891,726
๐Ÿ“š
9
Biography and History
567,666
๐Ÿ—ฟ
60
General Technology
6,663
๐Ÿ’ก
61
Medicine
229,772
๐Ÿ’‰
62
Engineering
113,470
๐Ÿ”ฉ
63
Agriculture & Animal Husbandry
64,632
๐ŸŒฑ
64
Home Economics
125,409
๐Ÿ 
65
Business
109,750
๐Ÿ‘”
66
Chemical Technology
13,629
๐Ÿš€
67
Manufacturing
5,473
๐Ÿ“ฆ
68
Handicraft and Occupations
14,823
๐Ÿ”จ
69
Building
8,754
๐Ÿ‘ท
620
Engineering
15,072
๐Ÿ”ฉ
621
Mechanical Engineering and Machinery
35,206
๐Ÿญ
622
Mining Engineering and Mines and Mineral Resources
2,557
๐Ÿ•ณ
623
Military Engineering and Marine Engineering
11,179
โš“
624
Civil Engineering
6,203
๐ŸŒ‰
625
Road and Railroad
3,572
๐Ÿ›ค
626
--
29
๐Ÿคท
627
Hydraulic Engineering
1,236
๐ŸŒŠ
628
Sanitary; Municipal
5,391
๐Ÿšฝ
629
Other Branches
33,025
๐ŸŒฟ
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
621.384130621.384131
19
621.384132
27
621.384133
16
621.384134
3
621.384135
69
621.384136
29
621.384137621.384138621.384139
621.3841320
3
621.3841321
1
621.3841322621.3841323621.3841324
2
621.3841325621.3841326
2
621.3841327621.3841328621.3841329

Works under MDS 621.384132

1–26 of 26 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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