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Melvil Decimal System: 621.384132

Wording: Technology > Engineering, contracts > 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
196,272
โ„น๏ธ
1
Philosophy and Psychology
182,817
๐Ÿ’ญ
2
Religion
463,618
๐Ÿ™๐Ÿฝ
3
Social Sciences
1,017,722
๐Ÿ‘ซ
4
Language
130,463
๐Ÿ’ฌ
5
Mathematics and Science
322,970
๐Ÿ”ฌ
6
Technology
751,859
๐Ÿ’ก
7
Arts and Recreation
695,837
๐ŸŽจ
8
Literature
929,791
๐Ÿ“š
9
Biography and History
592,368
๐Ÿ—ฟ
60
General Technology
6,985
๐Ÿ’ก
61
Medicine
251,982
๐Ÿ’‰
62
Engineering, contracts
128,147
๐Ÿ”ฉ
63
Agriculture & Animal Husbandry
68,016
๐ŸŒฑ
64
Home Economics
130,045
๐Ÿ 
65
Business
119,888
๐Ÿ‘”
66
Chemical Technology
15,663
๐Ÿš€
67
Manufacturing
6,358
๐Ÿ“ฆ
68
Handicraft and Occupations
15,511
๐Ÿ”จ
69
Building
9,264
๐Ÿ‘ท
620
Engineering
18,961
๐Ÿ”ฉ
621
Mechanical Engineering and Machinery
40,539
๐Ÿญ
622
Mining Engineering and Mines and Mineral Resources
2,834
๐Ÿ•ณ
623
Military Engineering and Marine Engineering
11,904
โš“
624
Civil Engineering
7,081
๐ŸŒ‰
625
Road and Railroad
3,893
๐Ÿ›ค
626
--
37
๐Ÿคท
627
Hydraulic Engineering
1,379
๐ŸŒŠ
628
Sanitary; Municipal
6,166
๐Ÿšฝ
629
Other Branches
35,353
๐ŸŒฟ
621.0
1,010
621.1
Steam engineering
504
621.2
Hydraulic machinery
203
621.3
Electric engineering
28,314
621.4
Heat engineering
3,312
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
2,179
621.9
Machine-tools
1,070
621.30
420
621.31
4,008
621.32
296
621.33
30
621.34
104
621.35
27
621.36
2,576
621.37
108
621.38
Electronics, Communications.
17,177
621.39
Computers
2,162
621.380
Light current engineering
262
621.381
Electronics
7,713
621.382
Communications
3,698
621.383
Telegrapy
24
621.384
Radar, Radio.
2,928
621.385
Telephony
268
621.386
Telephone terminal equipment
58
621.387
Telephone transmission equipment
21
621.388
Television
654
621.389
Audio, sound engineering
872
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
288
621.3849
1
621.38410
12
621.38411
65
621.38412
65
621.38413
180
621.38414621.38415
62
621.38416
177
621.38417
7
621.38418
64
621.38419
108
621.384130621.384131
18
621.384132
29
621.384133
15
621.384134
3
621.384135
77
621.384136
28
621.384137621.384138621.384139
621.3841320
4
621.3841321
1
621.3841322621.3841323621.3841324
2
621.3841325621.3841326
2
621.3841327621.3841328621.3841329

Works under MDS 621.384132

1–27 of 27 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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