# Relationship history for MSHA mine 1505209

Current hierarchy: **Jody  Samons → Big K Coal Company Inc → No 1**

- 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:** Grethel Mining Company → No 1; 1950-01-01 to 1976-07-23; source msha-controller-operator-history
- **controller_controls_mine:** Lackett Gloria → No 1; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lackett Gloria → Grethel Mining Company; 1950-01-01 to 1976-07-23; source msha-controller-operator-history
- **controller_controls_mine:** Sammons Grover → No 1; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Mitch Coal Company Inc → No 1; 1976-07-24 to 1987-02-16; source msha-controller-operator-history
- **controller_controls_operator:** Sammons Grover → Mitch Coal Company Inc; 1976-07-24 to 1987-02-16; source msha-controller-operator-history
- **operator_operates_mine:** Big K Coal Company Inc → No 1; 1987-02-17 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Jody  Samons → No 1; 1987-02-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jody  Samons → Big K Coal Company Inc; 1987-02-17 to current/open; source msha-controller-operator-history