# Relationship history for MSHA mine 1514631

Current hierarchy: **Couch Farmer → F & B Coals 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:** W J D Coal Company Inc → No 1; 1984-05-01 to 1985-01-08; source msha-controller-operator-history
- **controller_controls_mine:** Jackson Barry → No 1; 1984-05-01 to 1985-01-08; source msha-controller-operator-history
- **controller_controls_operator:** Jackson Barry → W J D Coal Company Inc; 1984-05-01 to 1985-01-08; source msha-controller-operator-history
- **operator_operates_mine:** F & B Coals Inc → No 1; 1985-01-09 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Couch Farmer → No 1; 1985-01-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Couch Farmer → F & B Coals Inc; 1985-01-09 to current/open; source msha-controller-operator-history