# Relationship history for MSHA mine 0301629

Current hierarchy: **Donnie L  Bookout → TRICO Quarry → PIT NO. 1**

- 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:** Edwards Brothers Inc → PIT NO. 1; 1987-05-01 to 2011-06-16; source msha-controller-operator-history
- **controller_controls_mine:** Don  Edwards → PIT NO. 1; 1987-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Don  Edwards → Edwards Brothers Inc; 1987-05-01 to 2011-06-16; source msha-controller-operator-history
- **operator_operates_mine:** TRICO Quarry → PIT NO. 1; 2011-06-17 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Donnie L  Bookout → PIT NO. 1; 2011-06-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Donnie L  Bookout → TRICO Quarry; 2011-06-17 to current/open; source msha-controller-operator-history