# Relationship history for MSHA mine 0102146

Current hierarchy: **Lafarge S A → Citadel Cement Corp → Demopolis Quarry**

- 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:** Citadel Cement Corp → Demopolis Quarry; 1979-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Lafarge S A → Demopolis Quarry; 1979-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lafarge S A → Citadel Cement Corp; 1979-01-01 to current/open; source msha-controller-operator-history