Document g2R5LMB3MaxeBEb7zom1eZax3

6 December 1967 Mr H E Ayer B.S. Division of Occupational Health U.S.P .H.S. 1014 Broadway Cincinnati, Ohio, U*S.A, ' Dear Mr Ayer, I understand that you have recently been investigating the generation of free asbestos arising from the decomposition of brake shoes. This is a subject which we are concerned with at the moment, particularly with regard to service operations involving the cleaning of brake assemblies by compressed air jets* I should be most interested to receive from you any of your publications which relate to this problem and* in particular, to hear of any views whioh you may have regarding the state of the asbestos in the dust which accumulates in automobile brake drums. Kind regards. Yours sincerely Dr D E Hickish Industrial Hygiene Specialist 3350 HFM - 005781 Boom 1/163 DEH/VJS 8006 1195