# Relationship history for MSHA mine 2200472

Current hierarchy: **L & A Contracting Company → Ancient Rivers Mining Company → Crossroads Pit**

- 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:** Ancient Rivers Mining Company → Crossroads Pit; 1978-03-09 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** L & A Contracting Company → Crossroads Pit; 1978-03-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** L & A Contracting Company → Ancient Rivers Mining Company; 1978-03-09 to current/open; source msha-controller-operator-history