Bearings [machine parts]; bearings made of plastic material and components which are subjected to sliding or rubbing force of a mechanical nature, namely bushings, bearings and gearings; bushings and gearings [machine parts]; valves as machine components; non-return valves of plastic [parts of machines], stop valves of plastic [parts of machines]; valve seats [machine parts]; valve inserts [machine parts]; bearing inserts [machine parts].;
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