# Relationship history for MSHA mine 3401120

Current hierarchy: **Comanche County-Ok → Comanche County → Lester Brown Gravel 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:** Comanche County → Lester Brown Gravel Pit; 1978-03-09 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Comanche County-Ok → Lester Brown Gravel Pit; 1978-03-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Comanche County-Ok → Comanche County; 1978-03-09 to current/open; source msha-controller-operator-history