# Relationship history for MSHA mine 4606487

Current hierarchy: **Willie  Blankenship → F & B Coal Inc → Alma No 2**

- 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:** Willie  Blankenship → Alma No 2; 1977-03-04 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Cummings Thomas → Alma No 2; 1980-08-27 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Cumberland Village Mining Group Inc → Alma No 2; 1981-11-01 to 1983-04-06; source msha-controller-operator-history
- **controller_controls_operator:** Cummings Thomas → Cumberland Village Mining Group Inc; 1981-11-01 to 1983-04-06; source msha-controller-operator-history
- **operator_operates_mine:** Fannin Coal Company Inc → Alma No 2; 1983-04-07 to 1985-10-08; source msha-controller-operator-history
- **controller_controls_mine:** Jack  Fannin et al → Alma No 2; 1983-04-07 to 1985-10-08; source msha-controller-operator-history
- **controller_controls_operator:** Jack  Fannin et al → Fannin Coal Company Inc; 1983-04-07 to 1985-10-08; source msha-controller-operator-history
- **operator_operates_mine:** F & B Coal Inc → Alma No 2; 1985-10-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Willie  Blankenship → F & B Coal Inc; 1985-10-09 to current/open; source msha-controller-operator-history