# Relationship history for MSHA mine 1100788

Current hierarchy: **Carmeuse Holding SA → Marblehead Lime Company → THORNTON 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Marblehead Lime Company → THORNTON PLANT; 1950-01-01 to 1994-05-07; source msha-controller-operator-history
- **controller_controls_mine:** General Dynamics Corp → THORNTON PLANT; 1950-01-01 to 1994-05-08; source msha-controller-operator-history
- **controller_controls_operator:** General Dynamics Corp → Marblehead Lime Company; 1950-01-01 to 1994-05-07; source msha-controller-operator-history
- **operator_operates_mine:** Marblehead Lime Company → THORNTON PLANT; 1994-05-08 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Carmeuse Holding SA → THORNTON PLANT; 1994-05-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Carmeuse Holding SA → Marblehead Lime Company; 1994-05-08 to current/open; source msha-controller-operator-history