# Relationship history for MSHA mine 4605389

Current hierarchy: **Ball Talbert → Black Gold Coal Company → No 1 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:** Ball Talbert → No 1 Mine; 1976-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Black Gold Coal Company → No 1 Mine; 1977-01-01 to 1977-04-27; source msha-controller-operator-history
- **controller_controls_mine:** Hale Jack T → No 1 Mine; 1977-01-01 to 1977-04-27; source msha-controller-operator-history
- **controller_controls_operator:** Hale Jack T → Black Gold Coal Company; 1977-01-01 to 1977-04-27; source msha-controller-operator-history
- **operator_operates_mine:** Black Gold Coal Company → No 1 Mine; 1977-04-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ball Talbert → Black Gold Coal Company; 1977-04-28 to current/open; source msha-controller-operator-history