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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