# Relationship history for MSHA mine 1512139

Current hierarchy: **Skeens Stanley → Cadillac Coal Company Inc → No 1**

- 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

- **controller_controls_mine:** Sullivan Darius L & James R → No 1; 1978-09-11 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Lester Robert F → No 1; 1979-05-01 to 1981-02-16; source msha-controller-operator-history
- **operator_operates_mine:** Spotless Coal Company Inc → No 1; 1979-11-01 to 1981-02-16; source msha-controller-operator-history
- **controller_controls_operator:** Lester Robert F → Spotless Coal Company Inc; 1979-11-01 to 1981-02-16; source msha-controller-operator-history
- **operator_operates_mine:** Sullivan Brothers Coal Company → No 1; 1981-02-17 to 1982-03-02; source msha-controller-operator-history
- **controller_controls_operator:** Sullivan Darius L & James R → Sullivan Brothers Coal Company; 1981-02-17 to 1982-03-02; source msha-controller-operator-history
- **operator_operates_mine:** Cadillac Coal Company Inc → No 1; 1982-03-03 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Skeens Stanley → No 1; 1982-03-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Skeens Stanley → Cadillac Coal Company Inc; 1982-03-03 to current/open; source msha-controller-operator-history