# Relationship history for MSHA mine 4404161

Current hierarchy: **Lester Earl → Black Stone 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

- **operator_operates_mine:** Black Stone Coal Company Inc → No 1 Mine; 1975-01-01 to 1976-02-18; source msha-controller-operator-history
- **controller_controls_mine:** Elswick Jay Carl → No 1 Mine; 1975-01-01 to 1976-02-18; source msha-controller-operator-history
- **controller_controls_operator:** Elswick Jay Carl → Black Stone Coal Company Inc; 1975-01-01 to 1976-02-18; source msha-controller-operator-history
- **operator_operates_mine:** Black Stone Coal Company Inc → No 1 Mine; 1976-02-19 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Lester Earl → No 1 Mine; 1976-02-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lester Earl → Black Stone Coal Company Inc; 1976-02-19 to current/open; source msha-controller-operator-history