Document 858Jx65Zw50X8Q4oEXXoLjK7B

PLAINTIFF'S EXHIBIT BIR-I20 March 24, I960 Mr. Edwin Edberg The Koppers Company P. 0. Box 65 Monaea, Pennsylvania Dear Ed* We recently completed the axial compression teats on the 4* x d* panels you fabricated for us using Bird V3 skins* These tests were performed at Cornell University in accordance with ASTM H72-55* The report from Cornell hasn't arrived as yet* If my memory servos me right, the next step is to compare this data with similar data of your organisa tion for other skin materials in order to determine whether or not the V3 board has any structural properties. I expect the Cornell report any day. I plan to be at B.R.I. for the April 5th session, maybe our paths will cross. I hope things are progressing well with your Detroit venture. We would like to see some of the houses in Detroit when you have some constructed. Beat personal regards. Yours very truly, BIRD & SON, INC. NDO/rp Weed Reynolds Sallie Norman D. Olson Development Chemist BIRD 010740