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| Number | Title | Issue Date |
| 4558875 | Aqueously-swelling water stopper and a process for stopping water thereby The disclosed water stopper and water stopping process use an aqueously-swelling water-stopping composition consisting of 10 to 40 weight % of rubber whose main ingredient is polyisobutylene, 10 to 20 weight % of silicate, 10 to 60 weight % of bentonite, ... | 12/17/1985 |
