# Relationship history for MSHA mine 1507331

Current hierarchy: **Owen George W → Foothills 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:** Harris Johnny → No 1 Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** H & W Coal Company → No 1 Mine; 1974-01-01 to 1975-03-04; source msha-controller-operator-history
- **controller_controls_operator:** Harris Johnny → H & W Coal Company; 1974-01-01 to 1975-03-04; source msha-controller-operator-history
- **operator_operates_mine:** Foothills Coal Company → No 1 Mine; 1975-03-05 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Owen George W → No 1 Mine; 1975-03-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Owen George W → Foothills Coal Company; 1975-03-05 to current/open; source msha-controller-operator-history