# Relationship history for MSHA mine 2200592

Current hierarchy: **Michael A  Bush → Bush Construction Company Inc → MATHIS 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

- **controller_controls_mine:** Trudie P  Westmoreland → MATHIS PIT; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Michael A  Bush  et al → MATHIS PIT; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Westmoreland Gravel Company Inc → MATHIS PIT; 1987-03-01 to 1993-09-08; source msha-controller-operator-history
- **controller_controls_operator:** Trudie P  Westmoreland → Westmoreland Gravel Company Inc; 1987-03-01 to 1993-09-08; source msha-controller-operator-history
- **operator_operates_mine:** Bush Construction Company Inc → MATHIS PIT; 1993-09-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Michael A  Bush  et al → Bush Construction Company Inc; 1993-09-09 to current/open; source msha-controller-operator-history