Document 99k4QdEMrdmJK3KRzEJ8dV967

February 10, 1976 Hr. Jobn Harsh Rayfeestot-Manhettan# lac. 100 OjlM-cbv Drive Trunbull, Conn. 06611 Dear John: Per yenxr letter of February 9, 1976, Z is eadoelng copies ef the date seat to Dr. Selikaff. 1. &*S. Motor Vehicle manufacture,sod use 1904-76 2. Jacko piper on "brake and Clutch Sxiseloe* Generated During Vahids Operation*. *' Dr. Sellfcoff vis etteopting to quantify the noont of eabeSto* used Is brake linings tram 1920 to the present. Z l&dleated that 1 did not knov of assy such data. However, 1 indicated that regis tration figures rere available. Also the Jacks paper aide estisuites of asbestos used in brakes for 1972. 1 cautioned Dr# SellkBEftthat while be Bight'attempt correlation of earlier years asbestos usage based os vehlds usage is those peers, that data frm 1920 to the Bid 1930** Bight be subject to question linear 1/ Tbs percent of asbestos used is brake linings we* different (less) than today. 2. brake system* vers different. 3. Vehicle usage patterns vers different. SWD/lse Enel. Sincerely FEICTXCH KAXZ3LXALS STANDARDS INSTITUTE E. V. Drislane Executive Director WV-06045