Document 7OerG6wwRDoXG5XE7nBxmJ1V8

CCB PLAINTIFFS EXHIBIT AB-46 Hr. R.VaJ. Brown, Personnel Manager BB - Winchester October 30, 1969 Dear Bob: The question which you posed on respirators is a very common one. However, it is our conviction that a respirator must be U. S* Bureau of 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 Ho. 671 (copy attached). The types of respirators which you described, which the men like, is. commonly known as a "Martindale" d is of little or no value where health hazards re existent. This type of respirator should not utilized nor stocked in any Abex plant. I realize is does give the plant a problem of education - that f educating the workers to use the proper protective evice 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 job when your personnel are complaining about a MBA Dustfoe 66 respirator which only weighs three ounces. Good Luck! <sw* CHBics cct C. B. Mallory 'fcv.C. Blackwell, Jr SPNY 006360 *