# Relationship history for MSHA mine 1514688

Current hierarchy: **Burchett Jeff → Bcb Coal Company 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:** East Ky Jen-Dawn Mining Inc → No 1; 1984-06-01 to 1989-07-08; source msha-controller-operator-history
- **controller_controls_mine:** Clark Gregory-Tom Bow & Charles Hunt → No 1; 1984-06-01 to 1992-10-28; source msha-controller-operator-history
- **controller_controls_operator:** Clark Gregory-Tom Bow & Charles Hunt → East Ky Jen-Dawn Mining Inc; 1984-06-01 to 1989-07-08; source msha-controller-operator-history
- **operator_operates_mine:** Firefly Energy Inc → No 1; 1989-07-09 to 1990-10-31; source msha-controller-operator-history
- **controller_controls_mine:** Blackburn Tommy Jr & Anna → No 1; 1989-07-09 to 1990-10-31; source msha-controller-operator-history
- **controller_controls_operator:** Blackburn Tommy Jr & Anna → Firefly Energy Inc; 1989-07-09 to 1990-10-31; source msha-controller-operator-history
- **operator_operates_mine:** Bcb Coal Company Inc → No 1; 1990-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Burchett Jeff → No 1; 1990-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Burchett Jeff → Bcb Coal Company Inc; 1990-11-01 to current/open; source msha-controller-operator-history