abbr. |
Signature On File; Site Occupation Factor; Supervisor of Flight; Service Order Form (Tollmuch); sulphur in other forms (includes the following sources: sulphur dioxide present in waste gas at smelters, gypsum or anhydride, hydrogen sulphide content of oil refinery or coke oven gases, oil refinere acid sludge, spent acid, ferrous sulphate Jespa); sound on film |