# Relationship history for MSHA mine 1510941

Current hierarchy: **Salyers Larry → Big Bass Fuel Inc → No 1 Mine (D)**

- 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

- **controller_controls_mine:** Mullins Estill → No 1 Mine (D); 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Little & Mullins Coal Company Inc → No 1 Mine (D); 1977-11-01 to 1978-07-11; source msha-controller-operator-history
- **controller_controls_operator:** Mullins Estill → Little & Mullins Coal Company Inc; 1977-11-01 to 1978-07-11; source msha-controller-operator-history
- **operator_operates_mine:** Big Branch Fuel Inc → No 1 Mine (D); 1978-07-12 to 1980-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Reese Chester-Danny & Teddy D → No 1 Mine (D); 1978-07-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Reese Chester-Danny & Teddy D → Big Branch Fuel Inc; 1978-07-12 to 1980-03-31; source msha-controller-operator-history
- **operator_operates_mine:** Big Bass Fuel Inc → No 1 Mine (D); 1980-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Salyers Larry → No 1 Mine (D); 1980-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Salyers Larry → Big Bass Fuel Inc; 1980-04-01 to current/open; source msha-controller-operator-history