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Melvil Decimal System: 621.042

Wording: Technology > Engineering > Mechanical Engineering and Machinery > Not set > Not set > Not set

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

0
Information
174,442
โ„น๏ธ
1
Philosophy and Psychology
161,809
๐Ÿ’ญ
2
Religion
423,445
๐Ÿ™๐Ÿฝ
3
Social Sciences
881,483
๐Ÿ‘ซ
4
Language
118,029
๐Ÿ’ฌ
5
Mathematics and Science
274,025
๐Ÿ”ฌ
6
Technology
639,380
๐Ÿ’ก
7
Arts and Recreation
651,545
๐ŸŽจ
8
Literature
865,381
๐Ÿ“š
9
Biography and History
551,058
๐Ÿ—ฟ
60
General Technology
6,246
๐Ÿ’ก
61
Medicine
207,724
๐Ÿ’‰
62
Engineering
102,568
๐Ÿ”ฉ
63
Agriculture & Animal Husbandry
61,853
๐ŸŒฑ
64
Home Economics
123,000
๐Ÿ 
65
Business
99,261
๐Ÿ‘”
66
Chemical Technology
11,503
๐Ÿš€
67
Manufacturing
4,874
๐Ÿ“ฆ
68
Handicraft and Occupations
14,129
๐Ÿ”จ
69
Building
8,222
๐Ÿ‘ท
620
Engineering
12,105
๐Ÿ”ฉ
621
Mechanical Engineering and Machinery
31,214
๐Ÿญ
622
Mining Engineering and Mines and Mineral Resources
2,345
๐Ÿ•ณ
623
Military Engineering and Marine Engineering
10,859
โš“
624
Civil Engineering
5,409
๐ŸŒ‰
625
Road and Railroad
3,420
๐Ÿ›ค
626
--
29
๐Ÿคท
627
Hydraulic Engineering
1,059
๐ŸŒŠ
628
Sanitary; Municipal
4,548
๐Ÿšฝ
629
Other Branches
31,580
๐ŸŒฟ
621.0
536
621.1
Steam engineering
377
621.2
Hydraulic machinery
172
621.3
Electric engineering
21,836
621.4
Heat engineering
2,252
621.5
Pneumatic machinery and Compressed air and Refrigeration and refrigerating machinery
274
621.6
Fans (Machinery) and Pumping machinery
99
621.7
Production engineering and Factories and Machine-shop practice
83
621.8
Other mechanical engineering topics
1,780
621.9
Machine-tools
873
621.00
8
621.01
22
621.02
21
621.03
8
621.04
401
621.05
4
621.06
1
621.07
25
621.08
2
621.09
40
621.040621.041621.042
373
621.043621.044
24
621.045621.046621.047621.048621.049
621.0420
30
621.0421621.0422621.0423621.0424621.0425621.0426621.0427621.0428621.0429

Works under MDS 621.042

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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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