# Relationship history for MSHA mine 1510752

Current hierarchy: **Ousley Cecil D → Salt Lick Coal Company Inc → 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **controller_controls_mine:** Marsillett Paul T → No 1 Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Ivyton Coal Company Inc → No 1 Mine; 1977-09-01 to 1978-06-27; source msha-controller-operator-history
- **controller_controls_operator:** Marsillett Paul T → Ivyton Coal Company Inc; 1977-09-01 to 1978-06-27; source msha-controller-operator-history
- **operator_operates_mine:** Ivyton Coal Company Inc → No 1 Mine; 1978-06-28 to 1979-02-28; source msha-controller-operator-history
- **controller_controls_mine:** Owens Hershel → No 1 Mine; 1978-06-28 to 1979-07-15; source msha-controller-operator-history
- **controller_controls_operator:** Owens Hershel → Ivyton Coal Company Inc; 1978-06-28 to 1979-02-28; source msha-controller-operator-history
- **operator_operates_mine:** Ivyton Coal Company Inc → No 1 Mine; 1979-03-01 to 1984-06-21; source msha-controller-operator-history
- **controller_controls_operator:** Marsillett Paul T → Ivyton Coal Company Inc; 1979-03-01 to 1984-06-21; source msha-controller-operator-history
- **operator_operates_mine:** Salt Lick Coal Company Inc → No 1 Mine; 1984-06-22 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Ousley Cecil D → No 1 Mine; 1984-06-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ousley Cecil D → Salt Lick Coal Company Inc; 1984-06-22 to current/open; source msha-controller-operator-history