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ลำดับที่	LC	คำอธิบาย
1		Mechanical engineering and machinery
2		Machinery exclusive of prime movers
3		Machine shops and machine shop practice
4		Hoisting and conveying machinery
5		Lifting and pressing machinery
6		Agricultural machinery. Farm machinery
7		Sewing machines
8		Power resources
9		Energy conservation
10		Mechanics applied to machinery. Dynamics
11		Mechanical movements
12		Mechanical devices and figures. Automata. Ingenious mechanisms. Robots (General)
13		Control engineering systems. Automatic machinery (General)
14		Machine design and drawing
15		Machine construction (General)
16		Heat engines
17		Turbines. Turbomachines (General)
18		Steam engineering
19		Locomotives
20		Miscellaneous motors and engines Including gas, gasoline, diesel engines
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