# Relationship history for MSHA mine 0301546

Current hierarchy: **Fondren Leo → Fondren Construction Company Inc → Dora 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:** Fondren Construction Company Inc → Dora Quarry; 1983-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Fondren Leo → Dora Quarry; 1983-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Fondren Leo → Fondren Construction Company Inc; 1983-04-01 to current/open; source msha-controller-operator-history