# Relationship history for MSHA mine 1508514

Current hierarchy: **Adkison John & Leonard Young → Young & Adkison Coal Company → No 1 Mine**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **controller_controls_mine:** Clevinger Bruce → No 1 Mine; 1974-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** J L B Coal Co Inc → No 1 Mine; 1975-01-01 to 1977-07-14; source msha-controller-operator-history
- **controller_controls_operator:** Clevinger Bruce → J L B Coal Co Inc; 1975-01-01 to 1977-07-14; source msha-controller-operator-history
- **operator_operates_mine:** Mc Dougal Coal Company Inc → No 1 Mine; 1977-07-15 to 1977-09-20; source msha-controller-operator-history
- **controller_controls_mine:** Mc Dougal Wayne → No 1 Mine; 1977-07-15 to 1977-09-20; source msha-controller-operator-history
- **controller_controls_operator:** Mc Dougal Wayne → Mc Dougal Coal Company Inc; 1977-07-15 to 1977-09-20; source msha-controller-operator-history
- **operator_operates_mine:** Young & Adkison Coal Company → No 1 Mine; 1977-09-21 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Adkison John & Leonard Young → No 1 Mine; 1977-09-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Adkison John & Leonard Young → Young & Adkison Coal Company; 1977-09-21 to current/open; source msha-controller-operator-history