prov:value
| - Exemplary primary lubricants include metallic lubricants (typically dry although other matter states are also acceptable in some embodiments), graphite or boron nitride, for example molybdenum (IV) sulphide, molybdenum disulphide, molybdenum sulphide, molybdenum sulphide, molybdenum (IV) selenide, molybdenum selenide, tungsten (IV) sulphide, tungsten disulphide, tungsten sulphide, graphite, and bo
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