# Relationship history for MSHA mine 0100396

Current hierarchy: **Lhoist Group → Allied Lime Company → Montevallo Underground**

- 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

- **operator_operates_mine:** Allied Products Company → Montevallo Underground; 1950-01-01 to 1989-07-30; source msha-controller-operator-history
- **controller_controls_mine:** M A  Rikard → Montevallo Underground; 1950-01-01 to 1989-07-30; source msha-controller-operator-history
- **controller_controls_operator:** M A  Rikard → Allied Products Company; 1950-01-01 to 1989-07-30; source msha-controller-operator-history
- **operator_operates_mine:** Allied Lime Company → Montevallo Underground; 1989-07-31 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Chemical Lime Company → Montevallo Underground; 1989-07-31 to 1998-12-30; source msha-controller-operator-history
- **controller_controls_operator:** Chemical Lime Company → Allied Lime Company; 1989-07-31 to 1998-12-30; source msha-controller-operator-history
- **controller_controls_mine:** Lhoist Group → Montevallo Underground; 1998-12-31 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lhoist Group → Allied Lime Company; 1998-12-31 to current/open; source msha-controller-operator-history