February 19, 1929 Mr.

November 23, 1929 Mr.

& FORMNO. lO(s-570a) ri ( Ethyl Gasol ine Corporation 25 Broadway Int er -Of f ic e Cor r espondenc e N e w Y ork February 25, 1927* Dr.

Penns Grcwe, 11J.

t I n t er *-Of f i c e Co r r espo n d en c e Et h y l Ga so l i n e Co r po r a t i o n 25 BROADWAY N E W Y O R K O ctober 25, 1928.

SCIENCE SERVICE THE INSTITUTION FOR THE POPULARIZAT ION OF SCIENCE organized 1921 as a non profit corporat ion, wit h t rust ees ` nominat ed by t he Nat ional Academ y of Sciences, t he Nat -onal Research Council, t he American Associat ion f or t he Advancement of Science, the E.

April 16, 1929 Mr, Calvin P.'

CoIrnrteeshp-oOnfdfieonece Ethyl Gasol ine Corporation 35 Broadway .

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Ap ril 25 1925 Dr R B H* Grndwohl Gradwohl La b o r a to r i e s 551I4.

COIlsitHeErS-POOfNfDiEoNeCE E t h y l G a soline C o r p o r a t i o n 2 5 Broadway N e w Y ork July 9, 1929. , Dr.

June 14, 1929 Doctor Fred B.

De l c o -Li g h t Co m pa n y .