# Relationship history for MSHA mine 2200148

Current hierarchy: **Cook William G Jr → Cook Construction Company Inc → Hanson 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Contractors Gravel Company Inc → Hanson Pit; 1950-01-01 to 1983-01-05; source msha-controller-operator-history
- **controller_controls_mine:** Phillips W R (Billy) → Hanson Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Phillips W R (Billy) → Contractors Gravel Company Inc; 1950-01-01 to 1983-01-05; source msha-controller-operator-history
- **controller_controls_mine:** Cook William G Jr → Hanson Pit; 1981-03-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Cook Construction Company Inc → Hanson Pit; 1983-01-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cook William G Jr → Cook Construction Company Inc; 1983-01-06 to current/open; source msha-controller-operator-history