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Code · CFR · Title 30 — Mineral Resources · Part 57 · § 57.8535

§ 57.8535. Seals.

34 words·~1 min read·/us/cfr/t30/s§ 57.8535·

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Seals shall be provided with a means for checking the quality of air behind the seal and a means to prevent a water head from developing unless the seal is designed to impound water.
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