# Relationship history for MSHA mine 4605971

Current hierarchy: **Mullins Harold → J T N Coal Company Inc → No 1 Surface**

- 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:** M & D Mining Company Inc → No 1 Surface; 1979-02-01 to 1982-06-10; source msha-controller-operator-history
- **controller_controls_mine:** Bryant Milo → No 1 Surface; 1979-02-01 to 1982-06-10; source msha-controller-operator-history
- **controller_controls_operator:** Bryant Milo → M & D Mining Company Inc; 1979-02-01 to 1982-06-10; source msha-controller-operator-history
- **controller_controls_mine:** Energy Management Corp → No 1 Surface; 1982-02-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Energy Coal Income Partnership → No 1 Surface; 1982-06-11 to 1988-09-20; source msha-controller-operator-history
- **controller_controls_operator:** Energy Management Corp → Energy Coal Income Partnership; 1982-06-11 to 1988-09-20; source msha-controller-operator-history
- **operator_operates_mine:** J T N Coal Company Inc → No 1 Surface; 1988-09-21 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Mullins Harold → No 1 Surface; 1988-09-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mullins Harold → J T N Coal Company Inc; 1988-09-21 to current/open; source msha-controller-operator-history