# Relationship history for MSHA mine 3303722

Current hierarchy: **Monroe Dallas W → Westland Stone Inc → Patton Pit Strip**

- 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:** Westland Stone Inc → Patton Pit Strip; 1978-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Monroe Dallas W → Patton Pit Strip; 1978-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Monroe Dallas W → Westland Stone Inc; 1978-12-01 to current/open; source msha-controller-operator-history