# Relationship history for MSHA mine 4801280

Current hierarchy: **Lamb Larry N → Lamb Construction Company → Wood Mountain Crushing Site**

- 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

- **controller_controls_mine:** Lamb Larry N → Wood Mountain Crushing Site; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Lamb Construction Company → Wood Mountain Crushing Site; 1979-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lamb Larry N → Lamb Construction Company; 1979-01-01 to current/open; source msha-controller-operator-history