# Relationship history for MSHA mine 3606493

Current hierarchy: **Warner Company → Halfway Coal Yard Inc → T And T Strip Mine No 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:** Thompson Clinton → T And T Strip Mine No 2; 1974-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Warner Company → T And T Strip Mine No 2; 1975-04-02 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** T & T Clay Company → T And T Strip Mine No 2; 1977-08-01 to 1980-03-31; source msha-controller-operator-history
- **controller_controls_operator:** Thompson Clinton → T & T Clay Company; 1977-08-01 to 1980-03-31; source msha-controller-operator-history
- **operator_operates_mine:** Halfway Coal Yard Inc → T And T Strip Mine No 2; 1980-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Warner Company → Halfway Coal Yard Inc; 1980-04-01 to current/open; source msha-controller-operator-history