Document MJm6NpKRLJJBmvyZZVz8MrDj

CCB U PLAINTIFFS EXHIBIT AB-46 October 30, 1969 Nr. RAnS. Brown# Personnel Manager BB - Winchester Bear Bob: The question which you posed on respirators is a very combos one. However, it is our conviction that a respirator must be U. S. Bureau o Mines approved for the particular application. When such a respirator is utilised its effectiveness for the particular job is not questioned. This thought is the basic line in Industrial Hygiene Bulletin Bo. 671 (copy attached). The types of respirators which you described# which the sen like# J.s. commonly known as a "Martindale" d is of little or no value where health hazards e existent. This type of respirator should not utilized nor stocked in any Abex plant. X realize is does give the plant a problem of education - that f educating the workers to use the proper protective vice for the job at band. However# this is the only tbod that you can utilize and know that your workers are protected. However# this may be quite a jab when your personnel are complaining about a MSA Dustfoe 66 respirator which only weighs three ounces. Qood Xiuck! C. H. BORCHHRDXNG. JR.# CHBics cct C. B. Mallory 'fcv^C. Blackwell, Jr., M i AB EX-089 SPNY 006360 ` SCF-ABEX-1235