# Relationship history for MSHA mine 1504209

Current hierarchy: **Huston Hubert → Sharp Coal Company Inc → 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Earl Cook Coal Corp → No 1; 1950-01-01 to 1981-02-26; source msha-controller-operator-history
- **controller_controls_mine:** Tester Billy & Patsy → No 1; 1950-01-01 to 1981-02-26; source msha-controller-operator-history
- **controller_controls_operator:** Tester Billy & Patsy → Earl Cook Coal Corp; 1950-01-01 to 1981-02-26; source msha-controller-operator-history
- **operator_operates_mine:** Jap-Eye Coal Corp → No 1; 1981-02-27 to 1981-08-04; source msha-controller-operator-history
- **controller_controls_mine:** Layne Leon → No 1; 1981-02-27 to 1981-08-04; source msha-controller-operator-history
- **controller_controls_operator:** Layne Leon → Jap-Eye Coal Corp; 1981-02-27 to 1981-08-04; source msha-controller-operator-history
- **operator_operates_mine:** Three R Coal Corp → No 1; 1981-08-05 to 1982-03-22; source msha-controller-operator-history
- **controller_controls_mine:** Mounts Rick A → No 1; 1981-08-05 to 1982-03-22; source msha-controller-operator-history
- **controller_controls_operator:** Mounts Rick A → Three R Coal Corp; 1981-08-05 to 1982-03-22; source msha-controller-operator-history
- **operator_operates_mine:** Spinner Coal Corp → No 1; 1982-03-23 to 1984-06-28; source msha-controller-operator-history
- **controller_controls_mine:** Mounts Vivian → No 1; 1982-03-23 to 1984-06-28; source msha-controller-operator-history
- **controller_controls_operator:** Mounts Vivian → Spinner Coal Corp; 1982-03-23 to 1984-06-28; source msha-controller-operator-history
- **operator_operates_mine:** Sharp Coal Company Inc → No 1; 1984-06-29 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Huston Hubert → No 1; 1984-06-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Huston Hubert → Sharp Coal Company Inc; 1984-06-29 to current/open; source msha-controller-operator-history