# Relationship history for MSHA mine 3100706

Current hierarchy: **Blaylock Hal → Blaylock Construction Company Inc → Young-Mangum 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:** Blaylock Construction Company Inc → Young-Mangum Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Blaylock Hal → Young-Mangum Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Blaylock Hal → Blaylock Construction Company Inc; 1950-01-01 to current/open; source msha-controller-operator-history