Explanatory notes
… packing, etc., materials). Crude asbestos fibres or those simply graded according to length, beaten or cleaned … be drawn, long fibres are used for spinning, while the shorter fibres are used for the manufacture of board, felt, … jackets, trousers, aprons, sleeves, gloves, mitts, gaiters, hoods and masks usually with mica eyepieces, helmets, boots …