# Relationship history for MSHA mine 1510725

Current hierarchy: **Compton Denver → Leatherwood Mining 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:** Deepcoal Mining Company Inc → No 1 Mine; 1977-09-01 to 1980-02-20; source msha-controller-operator-history
- **controller_controls_mine:** Smith Harry & Jamey → No 1 Mine; 1977-09-01 to 1980-02-20; source msha-controller-operator-history
- **controller_controls_operator:** Smith Harry & Jamey → Deepcoal Mining Company Inc; 1977-09-01 to 1980-02-20; source msha-controller-operator-history
- **controller_controls_mine:** Michaels Robert K → No 1 Mine; 1978-03-01 to 1980-04-06; source msha-controller-operator-history
- **operator_operates_mine:** Knight Coal Company Inc → No 1 Mine; 1980-02-21 to 1980-04-06; source msha-controller-operator-history
- **controller_controls_operator:** Michaels Robert K → Knight Coal Company Inc; 1980-02-21 to 1980-04-06; source msha-controller-operator-history
- **operator_operates_mine:** S & S Coal Company → No 1 Mine; 1980-04-07 to 1981-06-17; source msha-controller-operator-history
- **controller_controls_mine:** Haddix Shafter & Silas Joseph → No 1 Mine; 1980-04-07 to 1982-02-15; source msha-controller-operator-history
- **controller_controls_operator:** Haddix Shafter & Silas Joseph → S & S Coal Company; 1980-04-07 to 1981-06-17; source msha-controller-operator-history
- **operator_operates_mine:** Leatherwood Mining Company Inc → No 1 Mine; 1981-06-18 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Compton Denver → No 1 Mine; 1981-06-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Compton Denver → Leatherwood Mining Company Inc; 1981-06-18 to current/open; source msha-controller-operator-history