# Relationship history for MSHA mine 4403481

Current hierarchy: **Dotson John W & Harold Fred Justus → Dotson & Justus Coal Company Inc → No 4 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:** Bimbo Coal Company Inc → No 4 Mine; 1950-01-01 to 1978-02-28; source msha-controller-operator-history
- **controller_controls_mine:** Crumb Jack & Hursel H Justus → No 4 Mine; 1950-01-01 to 1978-02-28; source msha-controller-operator-history
- **controller_controls_operator:** Crumb Jack & Hursel H Justus → Bimbo Coal Company Inc; 1950-01-01 to 1978-02-28; source msha-controller-operator-history
- **controller_controls_mine:** Dotson John W & Harold Fred Justus → No 4 Mine; 1975-12-07 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Dotson & Justus Coal Company Inc → No 4 Mine; 1978-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dotson John W & Harold Fred Justus → Dotson & Justus Coal Company Inc; 1978-03-01 to current/open; source msha-controller-operator-history