# Relationship history for MSHA mine 1504126

Current hierarchy: **Strong Fred → Flaming Circle Coal Company Inc → No 1 Surface Mine**

- 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

- **operator_operates_mine:** Flaming Circle Coal Company Inc → No 1 Surface Mine; 1976-10-04 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Strong Fred → No 1 Surface Mine; 1976-10-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Strong Fred → Flaming Circle Coal Company Inc; 1976-10-04 to current/open; source msha-controller-operator-history