# Relationship history for MSHA mine 0503724

Current hierarchy: **Cochran Tom H & C J Vasilius → E & J Minerals Corp → Concord Minerals Corporation**

- 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:** Concord Corp → Concord Minerals Corporation; 1950-01-01 to 1984-01-08; source msha-controller-operator-history
- **operator_operates_mine:** Concord Minerals Corp → Concord Minerals Corporation; 1981-06-01 to 1984-01-08; source msha-controller-operator-history
- **controller_controls_operator:** Concord Corp → Concord Minerals Corp; 1981-06-01 to 1984-01-08; source msha-controller-operator-history
- **controller_controls_mine:** Cochran Tom H & C J Vasilius → Concord Minerals Corporation; 1983-07-11 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** E & J Minerals Corp → Concord Minerals Corporation; 1984-01-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cochran Tom H & C J Vasilius → E & J Minerals Corp; 1984-01-09 to current/open; source msha-controller-operator-history