# Relationship history for MSHA mine 4002798

Current hierarchy: **A J  Smith Jr → A J Smith Jr → Smith Mine #2**

- 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

- **controller_controls_mine:** A J  Smith Jr → Smith Mine #2; 1980-05-26 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Petro Chem Of Tennessee → Smith Mine #2; 1982-07-01 to 1983-06-29; source msha-controller-operator-history
- **controller_controls_mine:** Petro Chem Of Tennessee → Smith Mine #2; 1982-07-01 to 1983-06-29; source msha-controller-operator-history
- **controller_controls_operator:** Petro Chem Of Tennessee → Petro Chem Of Tennessee; 1982-07-01 to 1983-06-29; source msha-controller-operator-history
- **operator_operates_mine:** Tennessee Mining Inc → Smith Mine #2; 1983-06-30 to 1984-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Simpson Merle E → Smith Mine #2; 1983-06-30 to 1984-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Simpson Merle E → Tennessee Mining Inc; 1983-06-30 to 1984-12-31; source msha-controller-operator-history
- **operator_operates_mine:** A J Smith Jr → Smith Mine #2; 1985-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** A J  Smith Jr → A J Smith Jr; 1985-01-01 to current/open; source msha-controller-operator-history