| 507 / | HD | EARTH BORING, WELL TREATING, AND OIL FIELD CHEMISTRY |
| 200 | DF | WELL TREATING {4} |
| 203 | DF | .~ Contains organic component {17} |
| 209 | DF | .~.~ Organic component is carbohydrate or derivative thereof (e.g., sugar or gum, such as galactomannan, etc.) or carboxylic acid ester of an alcohol which has five or more hydroxy groups bonded directly to carbons {3} |
| 210 | | .~.~.~ Carbohydrate has been grafted onto solid synthetic resin |