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Melvil Decimal System: 621.309

Wording: Technology > Engineering > Mechanical Engineering and Machinery > Electric engineering > Not set > Biography; History By Place

Dewmoji: πŸ’‘ > πŸ”© > 🏭 > ? > ? > ?

0
Information
115,954
ℹ️
1
Philosophy and Psychology
115,844
πŸ’­
2
Religion
351,090
πŸ™πŸ½
3
Social Sciences
554,451
πŸ‘«
4
Language
75,777
πŸ’¬
5
Mathematics and Science
181,736
πŸ”¬
6
Technology
414,821
πŸ’‘
7
Arts and Recreation
444,897
🎨
8
Literature
605,140
πŸ“š
9
Biography and History
396,598
πŸ—Ώ
60
General Technology
4,675
πŸ’‘
61
Medicine
132,325
πŸ’‰
62
Engineering
60,124
πŸ”©
63
Agriculture & Animal Husbandry
41,598
🌱
64
Home Economics
88,244
🏠
65
Business
62,133
πŸ‘”
66
Chemical Technology
7,172
πŸš€
67
Manufacturing
3,235
πŸ“¦
68
Handicraft and Occupations
9,984
πŸ”¨
69
Building
5,331
πŸ‘·
620
Engineering
6,389
πŸ”©
621
Mechanical Engineering and Machinery
18,304
🏭
622
Mining Engineering and Mines and Mineral Resources
1,480
πŸ•³
623
Military Engineering and Marine Engineering
7,044
βš“
624
Civil Engineering
2,955
πŸŒ‰
625
Road and Railroad
2,173
πŸ›€
626
--
20
🀷
627
Hydraulic Engineering
616
🌊
628
Sanitary; Municipal
2,533
🚽
629
Other Branches
18,610
🌿
621.0
266
621.1
Steam engineering
250
621.2
Hydraulic machinery
94
621.3
Electric engineering
12,076
621.4
Heat engineering
1,196
621.5
Pneumatic machinery and Compressed air and Refrigeration and refrigerating machinery
158
621.6
Fans (Machinery) and Pumping machinery
64
621.7
Production engineering and Factories and Machine-shop practice
65
621.8
Other mechanical engineering topics
954
621.9
Machine-tools
523
621.30
261
621.31
1,515
621.32
166
621.33
13
621.34
40
621.35
12
621.36
803
621.37
55
621.38
Electronics, Communications.
7,719
621.39
Computers
921
621.300
2
621.301
25
621.302
31
621.303
10
621.304621.305
2
621.306
4
621.307
39
621.308
3
621.309
Biography; History By Place
141
621.3090
2
621.3091
1
621.3092
Biography
123
621.3093621.3094621.3095621.3096
Africa
1
621.3097
North America
5
621.3098621.3099

Works under MDS 621.309

1–50 of 135 ( next )titles | covers | shelf
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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

Related tags

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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