# Relationship history for MSHA mine 1507622

Current hierarchy: **Donald Ray  Tackett → Futurity Fuel 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

- **operator_operates_mine:** C Hall Coal Company → No 1 Mine; 1974-10-01 to 1977-07-07; source msha-controller-operator-history
- **controller_controls_mine:** Hall Charles D → No 1 Mine; 1974-10-01 to 1977-07-07; source msha-controller-operator-history
- **controller_controls_operator:** Hall Charles D → C Hall Coal Company; 1974-10-01 to 1977-07-07; source msha-controller-operator-history
- **operator_operates_mine:** Futurity Fuel Company → No 1 Mine; 1977-07-08 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Donald Ray  Tackett → No 1 Mine; 1977-07-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Donald Ray  Tackett → Futurity Fuel Company; 1977-07-08 to current/open; source msha-controller-operator-history