In this review the developments in the fields of lubricants, friction, and bearing materials have been summarized by various authorities in each particular field. The review covers the period from June to December, 1963. The developments in bearings and gears will be published at a later date. Much of the published work is concerned with high temperature and vacuum conditions. However, it is of interest to note the large increase in the published work in solid lubricants over that of previous years.

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