# Relationship history for MSHA mine 1502496

Current hierarchy: **Day Henry Jr → Flackey Coal Company Inc → 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:** Flackey Coal Company → No 1 Mine; 1950-01-01 to 1976-07-09; source msha-controller-operator-history
- **controller_controls_mine:** Dixon Sheldon → No 1 Mine; 1950-01-01 to 1976-07-09; source msha-controller-operator-history
- **controller_controls_operator:** Dixon Sheldon → Flackey Coal Company; 1950-01-01 to 1976-07-09; source msha-controller-operator-history
- **operator_operates_mine:** Flackey Coal Company Inc → No 1 Mine; 1976-07-10 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Day Henry Jr → No 1 Mine; 1976-07-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Day Henry Jr → Flackey Coal Company Inc; 1976-07-10 to current/open; source msha-controller-operator-history