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Tribology
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Here are entered all works relating to the supports used in engineering, and more particularly in machinery, especially for the moving parts --subdivision Bearings under individual land vehicles and types of land vehicles, e.g. Automobiles--Bearings
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--individual lubricants, e.g. Rosin oil; and subdivision Lubrication under individual land vehicles and types of land vehicles, e.g. Automobiles--Lubrication
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--subdivision Surfaces under individual chemicals and groups of chemicals and individual materials and types of materials, e.g. Copper--Surfaces; Metals--Surfaces
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