III. CENTRirUGATION 105 



COMMERCIAL SOURCES 



89. Specialized Instruments Corporation, Belmont, Calif. 



90. LKB Produkter Fabriks AB, Stockholm, Sweden. 



91 . Sharpies Corporation, Philadelphia, Pa. 



92. Fisher Scientific Co., Pittsburgh, Pa. 



93. International Equipment Co., Boston, Mass. 



94. Ivan Sorvall, Inc., 210 Fifth Ave., New York, N. Y. 



95. Gamma Scientific Co., Great Neck, L. I., N. Y. 



