# Relationship history for MSHA mine 1501911

Current hierarchy: **Poplar Creek Mining Company Inc → Poplar Creek Mining Company Inc → No 1 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Coal Stone Coal Company → No 1 Mine; 1950-01-01 to 1973-11-21; source msha-controller-operator-history
- **controller_controls_mine:** Coal Stone Coal Company → No 1 Mine; 1950-01-01 to 1973-11-21; source msha-controller-operator-history
- **controller_controls_operator:** Coal Stone Coal Company → Coal Stone Coal Company; 1950-01-01 to 1973-11-21; source msha-controller-operator-history
- **operator_operates_mine:** Poplar Creek Mining Company Inc → No 1 Mine; 1973-11-22 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Poplar Creek Mining Company Inc → No 1 Mine; 1973-11-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Poplar Creek Mining Company Inc → Poplar Creek Mining Company Inc; 1973-11-22 to current/open; source msha-controller-operator-history