Chapter 4: Division of Industrial Safety Subchapter 14: Petroleum Safety Orders--Drilling and Production (Sections 6500 - 6693) Article 28.: Ladders and Ladderway Openings for Derricks and Masts (Sections 6599 - 6601) Section 6601: All Masts: Ladderway Openings for All Platforms Other Than Crown Platforms. (Repealed)
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