# Relationship history for MSHA mine 4102363

Current hierarchy: **Terry  Weirich; Sandra  Danz → Weirich Brothers Inc → DAVIS 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:** Terry  Weirich et al → DAVIS PIT; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Weirich Brothers Inc → DAVIS PIT; 1985-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Terry  Weirich et al → Weirich Brothers Inc; 1985-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Sandra  Danz et al → Weirich Brothers Inc; 1985-09-01 to current/open; source msha-controller-operator-history