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\V illiain T . D avin , jH .D . W illiam B. Fry mark, M .D . Artkur P . LeBeau , M .D . GLadston e 5-3670 SJ'^ankLin. ^axiz INDUSTRIAL CLINIC 9701 W e st G r an d Atv-veennuuee Fr an k lin Parle, Illin ois 60131 May 2 3 r d , 1957, R o b e r t A, Keh oe, M.D. P r o fesso r Em eritus o f O ccu pation al Medicin e U n iversity of Cin cin n ati Department o f P reven tive M edicin e C in c in n a t i, Ohio 45219, Dear D r , Keh oe: I w ish t o th an k you fo r you r r e p l y t o my r e q u e st r e g a r d in g in fo r r aat io n con cern in g th e t o n ic it y o f le ad in occu p ation al co n d itio n s. Your in fo r m at io n was q u it e p e r t in e n t , an d h as h e lp e d u s to so lv e our i n i t i a l p r ob lem s a t t h e M o t o r o la Company in F r a n k lin P a r k , I l l i n o i s . Vie r e a l i s e t h a t we h ave a lo n g way t o go in c o n t r o l l i n g t h e o c c u p a t io n a l h azards in th e m an u factu rin g o f t e le v isio n t u b e s. However, our i n i t i a l problem was to determ in e a t what le v e l in d iv id u a ls sh ou ld be withdrawn from th e exp osu r e o f le a d , an d what w ere th e b e st meth ods o f t e st in g b o t h t h e b lo o d an d u r i n e , I n eed ed some d e f i n i t e c r i t e r i a in w h ich to work w ith , in ord er to p r e se n t to th e m an u factu rin g p eo p le. I n c i d e n t i a l l y , we h ave b een a b le sin c e t h e o n se t o f my r e l a t i o n s h i p s w ith th e le ad problem in th e tube m an u factu rin g in t h is company, to r e d u c e t h e a v e r a ge b lo o d le a d l e v e l o f t h e em ployee from 67 m icr o gr a n s p ercen t, t o 31 m icro gram s p e r c e n t . T h is h as been done e n t ir e ly by in d iv id u a l i n s t r u c t i o n , r e s p i r a t o r m ass, an d "go od h o u se k e e p in g". The a c t u a l m an u fact u r in g m eth ods h ave n ot ch an ged , an d a t th e p r e se n t tim e, I can n ot fo r e se e any a c t u a l ch an ges in t h e ir h an d lin g o f th e lead oxid e in th is ar e a. Thank you again fo r your k in d c o n sid e r a t io n an d prompt in fo r m at io n . Yours tr u ly 0015170 Ji l l i a m T . D av in , M.D. C la ss of 1952 U n iversity o f Cin cin n ati C ollege o f M edicin e.