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OCR Page 1 of 2March lst, 1933.
U.S.Department of Agriculture
Food & Drug Administration
Washington, D.C.
Gentlemen:
Attention J.W.Sale Food Control.
I have used a Wulf-Hess bifilar gamma ray electroscope
for the past ten years and I have found it to be the most
sensitive as wll as dependable instrument of this type on the
market. I can whole heartedly reconmend the instrument for
the type of work for which it is designed.
As far as I know the instrument is still manufactured
by Gunther and Tegetneyer, GosinescheStrasse 29A Braunshweig
Germany, in essentially the same design as the one we loaned
to the Public Health Service.
We shall be glad to give you any further information
we have on this subject which you may desire.
Very truly yours,
Vice President.
H.H.BarkertAf.
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