# Relationship history for MSHA mine 1514076

Current hierarchy: **Dawson Fred → Steven Lee Enterprises → 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Leonard  Hall → No 1; 1982-05-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Maple Ridge Mining Company Inc → No 1; 1983-06-01 to 1984-04-29; source msha-controller-operator-history
- **controller_controls_operator:** Leonard  Hall → Maple Ridge Mining Company Inc; 1983-06-01 to 1984-04-29; source msha-controller-operator-history
- **operator_operates_mine:** Steven Lee Enterprises → No 1; 1984-04-30 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Dawson Fred → No 1; 1984-04-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dawson Fred → Steven Lee Enterprises; 1984-04-30 to current/open; source msha-controller-operator-history