# Relationship history for MSHA mine 4002665

Current hierarchy: **Smith Russel G--Joe Evans → M & T Mining Company → No 1 Strip**

- 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:** Cox Construction & Mining → No 1 Strip; 1981-10-01 to 1981-11-17; source msha-controller-operator-history
- **controller_controls_mine:** Cox Darrel → No 1 Strip; 1981-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cox Darrel → Cox Construction & Mining; 1981-10-01 to 1981-11-17; source msha-controller-operator-history
- **operator_operates_mine:** M & T Mining Company → No 1 Strip; 1981-11-18 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Smith Russel G--Joe Evans Et Al → No 1 Strip; 1981-11-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Smith Russel G--Joe Evans Et Al → M & T Mining Company; 1981-11-18 to current/open; source msha-controller-operator-history