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May 20th, 1931.
Dr. J. S. Leake,
Office of Industrial Hygiene,
U.S. Department Public Health Service,
Washington, D.C.
Dear Dr. Leake:
We understand that your Departmenthas placed in the
hands of the clock companies the report of your investigation of the
luminous material industry.
This is a subject which is of vital importance to
us, and we would very much appreciate your sending to us a copy of
this report.
Very truly yours,
Vice President.
HHBarker:RH
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