# Relationship history for MSHA mine 0301403

Current hierarchy: **Bibeau Construction Company Inc → Ark Coal Company Inc → Philpott #1**

- 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:** Ark Coal Company Inc → Philpott #1; 1978-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Bibeau Construction Company Inc → Philpott #1; 1978-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bibeau Construction Company Inc → Ark Coal Company Inc; 1978-03-01 to current/open; source msha-controller-operator-history