# Relationship history for MSHA mine 1508908

Current hierarchy: **Adkins Morgan D & Roger D--James W Blackburn → Double A & B Coal Company → No 133 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:** Coleman Garry A → No 133 Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Bear Branch Coal Company → No 133 Mine; 1975-09-15 to 1977-06-29; source msha-controller-operator-history
- **controller_controls_operator:** Coleman Garry A → Bear Branch Coal Company; 1975-09-15 to 1977-06-29; source msha-controller-operator-history
- **operator_operates_mine:** Willow Oak Coal Company → No 133 Mine; 1977-06-30 to 1977-08-31; source msha-controller-operator-history
- **controller_controls_mine:** Ratliff Roy Dale & Baron Davis → No 133 Mine; 1977-06-30 to 1977-08-31; source msha-controller-operator-history
- **controller_controls_operator:** Ratliff Roy Dale & Baron Davis → Willow Oak Coal Company; 1977-06-30 to 1977-08-31; source msha-controller-operator-history
- **operator_operates_mine:** Double A & B Coal Company → No 133 Mine; 1977-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Adkins Morgan D & Roger D--James W Blackburn → No 133 Mine; 1977-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Adkins Morgan D & Roger D--James W Blackburn → Double A & B Coal Company; 1977-09-01 to current/open; source msha-controller-operator-history