# Relationship history for MSHA mine 3607024

Current hierarchy: **Smith Joseph F → Fairex Coal Company Inc → Fair Ex No 1**

- 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:** Fair Ex Coal Company Inc → Fair Ex No 1; 1980-08-01 to 1981-12-09; source msha-controller-operator-history
- **controller_controls_mine:** Bizich Charles Joseph → Fair Ex No 1; 1980-08-01 to 1981-12-09; source msha-controller-operator-history
- **controller_controls_operator:** Bizich Charles Joseph → Fair Ex Coal Company Inc; 1980-08-01 to 1981-12-09; source msha-controller-operator-history
- **operator_operates_mine:** Fairex Coal Company Inc → Fair Ex No 1; 1981-12-10 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Smith Joseph F → Fair Ex No 1; 1981-12-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Smith Joseph F → Fairex Coal Company Inc; 1981-12-10 to current/open; source msha-controller-operator-history