Sub-series 6. Research and Development Files, 1935-1980, undated

Arranged alphabetically by subject, this sub-series documents research and development work conducted by Betz Laboratories, Incorporated and its corporate predecessor W.H. & L.D. Betz. A large majority of the materials in this sub-series concern research and development work conducted by the Betz concern itself, much of which was eventually applied to the firm's products. A small amount of materials regarding research and development work carried out by Betz for a few of its customers are also preserved here.

Article reprints by Betz employees make up a majority of the materials found in this sub-series. A small, but noticeable number of conference and technical papers by Betz employees are also found in this sub-series. Two proposals, a few notes, a water analysis, and a newspaper article are found here as well.