# Relationship history for MSHA mine 1508284

Current hierarchy: **Sigmon Harold A → C & S Fuels Inc → No 1 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:** Ike Turner Coal Company → No 1 Surface; 1975-01-01 to 1976-10-31; source msha-controller-operator-history
- **controller_controls_mine:** Turner John → No 1 Surface; 1975-01-01 to 1976-10-31; source msha-controller-operator-history
- **controller_controls_operator:** Turner John → Ike Turner Coal Company; 1975-01-01 to 1976-10-31; source msha-controller-operator-history
- **operator_operates_mine:** C & S Fuels Inc → No 1 Surface; 1976-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Sigmon Harold A → No 1 Surface; 1976-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Sigmon Harold A → C & S Fuels Inc; 1976-11-01 to current/open; source msha-controller-operator-history