Document XOJMzxXbjoEXypO2M859Le9ow

February 10, 1976 Hr. John Harsh Raybestos-Manhattant Inc 100 Oakviev Drive Trumbull, Conn. 06611 Dear John: Per your letter of February 9, 1976, I am enclosing copies of the data sent to Dr. Selikoff. 1. U.S. Motor Vehicle manufacture,and use 1904-74 2. Jacko paper on '"Brake and Clutch Emissions Generated During Vehicle Operations." Ur. Selikoff was attempting to quantify the amount of asbestos used in brake linings from 1920 to the present. I indicated that 1 did not know of any such data. However, 1 indicated that regis tration figures were available. Also the Jacks paper made estimates of asbestos used in brakes for 1972. Z cautioned Dr. Selikoffthhat while be might'attempt correlation of earlier years asbestos usage based on vehicle usage is those years, that data from 2920 to the mid 1930's might be subject to question since: 1.` The percent of asbestos used in brake linings was different (less) than today. 2. Brake systems were different. 3. Vehicle usage patterns were different. Sincerely, FRICTION MATERIALS STANDARDS INSTITUTE EWD/lmc Encs. E. V. Drislane Executive Director