# Relationship history for MSHA mine 1510532

Current hierarchy: **Miller J T & Sandra K Sizemore → Rich Mountain Coal Company → Curly Fork 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:** Leslie Coal & Energy Engineering Inc → Curly Fork Surface; 1977-06-01 to 1978-10-03; source msha-controller-operator-history
- **controller_controls_mine:** Mc Intosh Donald T → Curly Fork Surface; 1977-06-01 to 1978-10-03; source msha-controller-operator-history
- **controller_controls_operator:** Mc Intosh Donald T → Leslie Coal & Energy Engineering Inc; 1977-06-01 to 1978-10-03; source msha-controller-operator-history
- **operator_operates_mine:** W-D Coal Company Inc → Curly Fork Surface; 1978-10-04 to 1979-04-10; source msha-controller-operator-history
- **controller_controls_mine:** White Letcher T → Curly Fork Surface; 1978-10-04 to 1979-04-10; source msha-controller-operator-history
- **controller_controls_operator:** White Letcher T → W-D Coal Company Inc; 1978-10-04 to 1979-04-10; source msha-controller-operator-history
- **operator_operates_mine:** Rich Mountain Coal Company → Curly Fork Surface; 1979-04-11 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Miller J T & Sandra K Sizemore → Curly Fork Surface; 1979-04-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Miller J T & Sandra K Sizemore → Rich Mountain Coal Company; 1979-04-11 to current/open; source msha-controller-operator-history