This document replaces LIGO document's M1000368 LLO Beam Tube Enclosure Entry and Egress Procedure, M990193 LLO BTE Entry Safety Procedure and M1300394 LIGO Observatory Confined Space Entry Plan, and makes them all obsolete.
Also, M990193 did not make the old to new DCC document migration, so it is not available on the DCC.
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