# Relationship history for MSHA mine 4200170

Current hierarchy: **Texaco Inc → Plateau Mining Company → Star Point 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** U N C Plateau Mining Company → Star Point No 1; 1950-01-01 to 1980-07-21; source msha-controller-operator-history
- **controller_controls_mine:** United Nuclear Corp → Star Point No 1; 1950-01-01 to 1980-07-21; source msha-controller-operator-history
- **controller_controls_operator:** United Nuclear Corp → U N C Plateau Mining Company; 1950-01-01 to 1980-07-21; source msha-controller-operator-history
- **controller_controls_mine:** Texaco Inc → Star Point No 1; 1980-07-21 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Plateau Mining Company → Star Point No 1; 1980-07-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Texaco Inc → Plateau Mining Company; 1980-07-22 to current/open; source msha-controller-operator-history