1. Franklin Institute Research Laboratories, Philadelphia, Pa.
2. Naval Air Development Center, Warminster, Pa.
3. Pitman-Dunn Laboratory, U. S. Army, Frankford Arsenal, Philadelphia, Pa.
4. Battelle Columbus Laboratories, Columbus, Ohio
5. Scotia, N. Y.
6. Mechanical Technology Inc., Latham, N. Y.
7. Research Laboratory, SKF Industries, Inc., King of Prussia, Pa.
8. Lubrication Mechanics, Westinghouse R&D Center, Pittsburgh, Pa.