# Relationship history for MSHA mine 1517240

Current hierarchy: **Tackett Freddie → Big Lump Coal Company Inc → Mine #8**

- 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

- **controller_controls_mine:** Mullins Dale Et Al → Mine #8; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Mullins & Sons Coal Company Inc → Mine #8; 1992-05-01 to 1993-11-22; source msha-controller-operator-history
- **controller_controls_operator:** Mullins Dale Et Al → Mullins & Sons Coal Company Inc; 1992-05-01 to 1993-11-22; source msha-controller-operator-history
- **operator_operates_mine:** Big Lump Coal Company Inc → Mine #8; 1993-11-23 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Tackett Freddie → Mine #8; 1993-11-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Tackett Freddie → Big Lump Coal Company Inc; 1993-11-23 to current/open; source msha-controller-operator-history