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/ . asr March 3 1, 1948 Mr. E . L. Sh ea, Eth yl Corporation ., Ch rysler Bu ild in g, lew York C it y 1 7 . Dear Mr. Sh ea: I am fo r w a r d in g t o you h e r e w it h a l e t t e r r e c e iv e d fr om D r . J . G. Tow n sen d, M ed ical D ir e c t o r an d C h ie f o f th e I n d u st r i a l H ygien e D ivision of th e 0. S. P u blic H ealth Se r v ic e . The q u e st io n in v o lv e d in t h i s s i t u a t i o n an d in t h e r e l a t i o n sh i p s th at have obtain ed over a period of years between r e p r e se n tativ e s o f Eth y l Corporation and th ose o f th e P u b lic h ealth Se r v ic e , i s a lo n g st o r y w h ich I s h a l l n o t go I n t o a t t h i s t im e , h o w e v e r , _I w ou ld l i k e t o d i s c u s s t h i s w h ole m a t t e r w it h you a t some ap p r o p r i a t e t im e . The p r e se n t l e t t e r i s m e r e ly an e x p r e ssio n t o you a s P r e sid e n t o f Eth y l Corporation , o f th e o f f i c i a l con sen t o f th e U. S. p u b lic n e alt h Se r v ic e to th e u se o f 4 .6 c . c . t e t r a e t h y l' lead in av iatio n ga so lin e . A ctu ally t h is con cen tration of lead h as been em ployed in m i l i t a r y f u e l s f o r some t im e , b u t th e Su r ge on G e n e r a l' s o ffi c e approved 4 .5 c . c . fo r u se in com m ercial g a so lin e s. Th i3 s i t u a t i o n r e s u l t e d in some d e g r e e o f c o n fu sio n in t h e m in d s o f p e o p le con cer n ed , e sp e c ia l l y in th e p etr oleu m in d u st r y . The r e so lu t io n o f t h is d i f f i c u l t y i s a good t h in g . I f you h ave any fu r t h e r im m ediate q u e st io n abou t th e sig n ific a n c e o f t h i s m a t t e r , I am su r e t h a t Grah am E d gar can an sw er i t f o r y o u . I t w ould b e w ise i f som e o f y o u r a s s o c i a t e s w ere in for m ed o f t h i s m atter ,, e sp e c ia l l y M r. Ju l i a n Fr e y and Mr. E . 0 . Jo n e s, sin c e both o f them w i l l h ave o c c a sio n t o d e a l w ith t h l3 q u e st io n in th e fu t u r e . C ord ially your3, PAK e f D ictated hut n ot read En c. lio b e r t A . lie h o e , M. DT HE 0 0 0 3 2 8 0