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June 28th,1928. Dr. E. S. Morton, Chief, Division of Industrial & Adult Hygiene, Department of Health, 505 Pearl St., N.Y.C. Dear Sir: Answering your letter of June 26th: Our customers who apply our Undark luminous material in their own plants in New York, are as follows: Ansonia Clock Company, 7th Ave. & 12th St., Brooklyn, N.Y. Breen Radium Products Co., 1417 Grand Central Terminal, New York City. Starkey Dial Company, 45 Lispenard St., N.Y.C. Sussfeld, Lorsch and Schimmel, 153 w. 23rd St, N.Y.C. Bulova Watch Company. 392 - 5th Ave., N.Y.C. Pioneer Instrument Co., 754 Lezington Ave., Brooklyn, N.Y. We have numerous customers located throughout the United States, but assume that you are only interested in those operating in New York. We have as a competitor the Radium Dial Company, of #l.East 42nd St., New York City. Trusting that the above is the information you desire, we are Respectifily yours, CBLee:RH President.