# Relationship history for MSHA mine 1501599

Current hierarchy: **Wellman Danny C → Oak Ridge Coal Company → No 2-C 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Mary Jean Coal Company → No 2-C Mine; 1950-01-01 to 1973-05-31; source msha-controller-operator-history
- **controller_controls_mine:** Mary Jean Coal Co → No 2-C Mine; 1950-01-01 to 1974-01-31; source msha-controller-operator-history
- **controller_controls_operator:** Mary Jean Coal Co → Mary Jean Coal Company; 1950-01-01 to 1973-05-31; source msha-controller-operator-history
- **operator_operates_mine:** Denise Coal Company → No 2-C Mine; 1973-06-01 to 1975-03-19; source msha-controller-operator-history
- **controller_controls_mine:** Wellman Clarence → No 2-C Mine; 1973-06-01 to 1975-03-19; source msha-controller-operator-history
- **controller_controls_operator:** Wellman Clarence → Denise Coal Company; 1973-06-01 to 1975-03-19; source msha-controller-operator-history
- **controller_controls_mine:** Wellman Willis → No 2-C Mine; 1974-02-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Sabrina Coal Company → No 2-C Mine; 1975-03-20 to 1975-07-18; source msha-controller-operator-history
- **controller_controls_mine:** Sabrina Coal Co → No 2-C Mine; 1975-03-20 to 1975-07-18; source msha-controller-operator-history
- **controller_controls_operator:** Sabrina Coal Co → Sabrina Coal Company; 1975-03-20 to 1975-07-18; source msha-controller-operator-history
- **operator_operates_mine:** Jimmies Creek Coal Company → No 2-C Mine; 1975-07-19 to 1977-03-10; source msha-controller-operator-history
- **controller_controls_operator:** Wellman Willis → Jimmies Creek Coal Company; 1975-07-19 to 1977-03-10; source msha-controller-operator-history
- **operator_operates_mine:** Oak Ridge Coal Company → No 2-C Mine; 1977-03-11 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Wellman Danny C → No 2-C Mine; 1977-03-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Wellman Danny C → Oak Ridge Coal Company; 1977-03-11 to current/open; source msha-controller-operator-history