# Relationship history for MSHA mine 0101945

Current hierarchy: **Duckett Thomas → Thomas Duckett Construction Company Inc → No 1 Strip**

- 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

- **controller_controls_mine:** Duckett Thomas → No 1 Strip; 1975-03-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Thomas Duckett Construction Company Inc → No 1 Strip; 1978-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Duckett Thomas → Thomas Duckett Construction Company Inc; 1978-10-01 to current/open; source msha-controller-operator-history