HEADWORK PHIL SWAIN BRINGS ENGINEERING ------ .

j l / j .. j ' Over a period there has been a good doal of correspondence on the matter of these Regulations and I am now writing to mention,^ if you do not indeed already know, that the formal Statutory Instrument, i960 No*1932, has recently been passed by Parliament and that the now body ofvRegulations will coma into force on 31st March 1961.

Page 2 functions at a 0.1 f/cc level --the standard level recom mended by NIOSH to OSHA -- by phase contrast microscopy at 400 - 450x magnification.

Juae 3, 1939 Mr* John Thesgson Mechanical Chief of Denver Plants Dear Sir!

h'xKCUTlvc On'ICCS Johns -Manvi i j.u Cokhowation rvKMV-r.s-o k.nvt j-ohtiutii struct NEW YORK.

P-NSC-36 National Safety News Published monthly in the interest of accident j National Safety Council prevention and the health of industrial workers ; Officers, I934-I935 John C.

Published Monthly by Texas Branch, A.

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were itous. le suglustrandered express (Cansupply 0 241, shed by 14- 201, 35 56, PULMONARY ASBESTOSIS V.

PLAINTIFF'S EXHIBIT ST0072292 I am Richard A.

S T 0850642 ABSTRACT OF THE LITERATURE OF INDUSTRIAL HYGIENE SUPPLEMENTARY TO THE JOURNAL OF INDUSTRIAL HYGIENE EDITORS DAVID L EDSALL, M.

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THE BULLETIN OF THE AMERICAN CERAMIC SOCIETY Volume 16 SEPTEMBER, 1937 Number 9 PLAINTIFFS is EXHIBIT IS See page 384 for story of Who Began Vitrified Porcelain CeramicWare?

Industrial Hygiene Digest INDUSTRIAL HEALTH NEWS LITERATURE ABSTRACTS MEDICAL MAY. 1935 (Vol. 19.