# Relationship history for MSHA mine 4104009

Current hierarchy: **Schlumberger Ltd → U S Clay L P → Alpine Plant**

- 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:** Stanley  Graves et al → Alpine Plant; 1998-01-13 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** U S Clay L P → Alpine Plant; 1998-06-01 to 2002-04-25; source msha-controller-operator-history
- **controller_controls_operator:** Stanley  Graves et al → U S Clay L P; 1998-06-01 to 2002-04-25; source msha-controller-operator-history
- **controller_controls_operator:** Wesley  Burkett et al → U S Clay L P; 1998-06-01 to 2002-04-25; source msha-controller-operator-history
- **operator_operates_mine:** U S Clay L P → Alpine Plant; 2002-04-26 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Schlumberger Ltd → Alpine Plant; 2002-04-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Schlumberger Ltd → U S Clay L P; 2002-04-26 to current/open; source msha-controller-operator-history