# Relationship history for MSHA mine 4404150

Current hierarchy: **Justus Theodore Coal Company → Theodore Justus Coal Co → 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** P & P Coal Co → No 1 Mine; 1975-01-01 to 1975-12-20; source msha-controller-operator-history
- **controller_controls_mine:** P & P Coal Co → No 1 Mine; 1975-01-01 to 1975-12-20; source msha-controller-operator-history
- **controller_controls_operator:** P & P Coal Co → P & P Coal Co; 1975-01-01 to 1975-12-20; source msha-controller-operator-history
- **operator_operates_mine:** Theodore Justus Coal Co → No 1 Mine; 1975-12-21 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Justus Theodore Coal Company → No 1 Mine; 1975-12-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Justus Theodore Coal Company → Theodore Justus Coal Co; 1975-12-21 to current/open; source msha-controller-operator-history