# Relationship history for MSHA mine 4104829

Current hierarchy: **Schlumberger Ltd → M I L.L.C. → MI SWACO-Alpine**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **controller_controls_mine:** Schlumberger Ltd → MI SWACO-Alpine; 1994-02-28 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** M I L.L.C. → MI SWACO-Alpine; 2010-06-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Schlumberger Ltd → M I L.L.C.; 2010-06-22 to current/open; source msha-controller-operator-history