# Relationship history for MSHA mine 1514703

Current hierarchy: **Hall Claude T & Wesley Gearheart → Martin T Mining & Exploration Company Inc → No 9**

- 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:** Big A Mining Inc → No 9; 1984-06-01 to 1984-11-07; source msha-controller-operator-history
- **controller_controls_mine:** Adkins Earl Et Al → No 9; 1984-06-01 to 1984-11-07; source msha-controller-operator-history
- **controller_controls_operator:** Adkins Earl Et Al → Big A Mining Inc; 1984-06-01 to 1984-11-07; source msha-controller-operator-history
- **operator_operates_mine:** H & L Coal Company Inc → No 9; 1984-11-08 to 1985-11-12; source msha-controller-operator-history
- **controller_controls_mine:** Hall Hargis → No 9; 1984-11-08 to 1985-11-12; source msha-controller-operator-history
- **controller_controls_operator:** Hall Hargis → H & L Coal Company Inc; 1984-11-08 to 1985-11-12; source msha-controller-operator-history
- **operator_operates_mine:** Martin T Mining & Exploration Company Inc → No 9; 1985-11-13 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Hall Claude T & Wesley Gearheart → No 9; 1985-11-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hall Claude T & Wesley Gearheart → Martin T Mining & Exploration Company Inc; 1985-11-13 to current/open; source msha-controller-operator-history