1. A. Mayer and S. Shwartzman U.S. Patent 3,893,869, July 8, (1975); assigned to RCA Corporation. The following companies are licensed by RCA to build cleaning systems: Fluorocarbon P.O. Box 3640 1432 South Allec St. Anaheim, California 92803 Interlab Inc. Precision Rd Danbury, Ct. 06810 Southern Scientific Associates, Inc. 304 Cynthia Lane Indian Harbour Beach, Florida 32935
2. W, Kern and D.A. Puotinen, RCA Review31, 187, (1970),