# Relationship history for MSHA mine 4606675

Current hierarchy: **Willie  Blankenship → F & B Coal Inc → Alma No 3 Mine**

- 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 3 Mine; 1977-03-04 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** B U M Coals Inc → Alma No 3 Mine; 1983-08-01 to 1984-01-25; source msha-controller-operator-history
- **controller_controls_mine:** Meadows Charles → Alma No 3 Mine; 1983-08-01 to 1984-01-25; source msha-controller-operator-history
- **controller_controls_operator:** Meadows Charles → B U M Coals Inc; 1983-08-01 to 1984-01-25; source msha-controller-operator-history
- **operator_operates_mine:** B U M Coals Inc → Alma No 3 Mine; 1984-01-26 to 1984-04-05; source msha-controller-operator-history
- **controller_controls_mine:** Burgess David → Alma No 3 Mine; 1984-01-26 to 1984-04-05; source msha-controller-operator-history
- **controller_controls_operator:** Burgess David → B U M Coals Inc; 1984-01-26 to 1984-04-05; source msha-controller-operator-history
- **operator_operates_mine:** F & B Coal Inc → Alma No 3 Mine; 1984-04-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Willie  Blankenship → F & B Coal Inc; 1984-04-06 to current/open; source msha-controller-operator-history