# Relationship history for MSHA mine 1509694

Current hierarchy: **Hovatter C E → Temco Coal Co Inc → No 2 Surface**

- 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:** Temco Coal Co Inc → No 2 Surface; 1976-05-05 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Hovatter C E → No 2 Surface; 1976-05-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hovatter C E → Temco Coal Co Inc; 1976-05-05 to current/open; source msha-controller-operator-history