21 : Mechanical systems and components for general use
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21 : Mechanical systems and components for general use
- 21.020 : Characteristics and design of machines, apparatus, equipment
- 21.040 : Screw threads
- 21.060 : Fasteners
- 21.080 : Hinges, eyelets and other articulated joints
- 21.100 : Bearings
- 21.120 : Shafts and couplings
- 21.140 : Seals, glands
- 21.160 : Springs
- 21.180 : Housings, enclosures, other machine parts
- 21.200 : Gears
- 21.220 : Flexible drives and transmissions
- 21.240 : Rotary-reciprocating mechanisms and their parts
- 21.260 : Lubrication systems
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