ETHYL CORPORATION RESEARCH AND ENGINEERING DEPARTMENT RESEARCH LABORATORIES 1600 WEST EIGHT MILE ROAD FERNDALE 20, DETROIT, MICHIGAN *^ May 28, 1956 Dr.

tffM L Ha^ ison.

October 26, 1938 HDLPolraa.crnrkCitpsaooPrnrlht,yMRsI*ailcdlHiiianalnltoloeirnsbDraivnidsion Dear Doctor Hlllenbrand: bhsagccthaaonolromesamanoplfppyhfidhlrlosaei,emercdstmseaa*nMnwteidocrhoeoitnrcyhtOnhehoinfecedoeirelyfmdnolsaiaaunotanmduttgtsisrpoeeitlghnern0pen*tr0ew0oivf2oa*faWin50istcodhe3eaumaea*wnhsncrihaeatlv^bloliyhyehlopgezaetiravenhrstaehddeeiemocernebserciexyDaovnpstpmiehdtoutehdphasrleluiattezsr1trtoheeeS0t*hned0apeariesegbctlhsMrltyaooemIpmeonoatdnsihnoodf, bsftooaemernyposluece*sovmewrpaillleltdebadey,ssebInustthttaohlelTybohinuee'forpaerwrmosamuyaltpitfotrslcnysnownwthhitelhenl.eblthaueebryifonorerhawatovaerryded Very truly yours, RAK: i s IXoberV""]^*"" Eehoe^WTD.

May 31, 1962 Mr.

- jTIC SERVICE V!

iAugust 3 1942 Mr.

x \s IV ~ s.S*' i , r ,& *f IN TE R -O FFICE CORRESPON DEN CE Et h y l Ga s o l i n e Co r po r a t i o n 1)a y t o >t Of f i c e Mu t u a l Ho m f B u i l d i n g 1 2 0 We s t Sr coN D St r e e t 1)a y t o i , 0h i o August 25, 1943 Dr.

JOHN F WEAVER,: PR.E.SIDEHT L*S*CASTER... f>.

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Janu ary '27 1939 Dp; John F ra n c is S o r e l l i Siiti.

May 6, 1957 DMCThoree.lduWimIcn.abdluEusI.

ELSTON L.

P OSTG RAD UATE EDUCATION THE UNIVERSITY OF TEXAS SOUTHWESTERN MEDICAL SCHOOL AT DALLAS August 3, 1970 5323 H A R R Y H IN E S B L V O ; .

ETHYL CORPORATION IN'T E R - O F F I C B , ' ' CORRESPOXOEXCS TO Hr.

ED GEW OOD 4-2908 CABLE AD D RESS: W I PPO D EPA RTM EN T OP RES EA RCH & D EV EL O PM EN T lisi W ES T FI FTH STREET AZUSA, CALI FO RN I A June 24, 1960 Robert A.