# Relationship history for MSHA mine 3601477

Current hierarchy: **Desort John → Ogletown Coal Company → John Desort 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:** Jerley Coal Company → John Desort Mine; 1950-01-01 to 1977-06-30; source msha-controller-operator-history
- **controller_controls_mine:** Jerley Coal Company → John Desort Mine; 1950-01-01 to 1977-06-30; source msha-controller-operator-history
- **controller_controls_operator:** Jerley Coal Company → Jerley Coal Company; 1950-01-01 to 1977-06-30; source msha-controller-operator-history
- **operator_operates_mine:** H & H Owens Coal Company → John Desort Mine; 1977-07-01 to 1977-11-28; source msha-controller-operator-history
- **controller_controls_mine:** Owens Harold L Jr & Sr → John Desort Mine; 1977-07-01 to 1977-11-28; source msha-controller-operator-history
- **controller_controls_operator:** Owens Harold L Jr & Sr → H & H Owens Coal Company; 1977-07-01 to 1977-11-28; source msha-controller-operator-history
- **operator_operates_mine:** Ogletown Coal Company → John Desort Mine; 1977-11-29 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Desort John → John Desort Mine; 1977-11-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Desort John → Ogletown Coal Company; 1977-11-29 to current/open; source msha-controller-operator-history