# Relationship history for MSHA mine 1516268

Current hierarchy: **Pendley Stanley → Poplar Grove Mining Inc → Turtle Dove Mines**

- 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:** Poplar Grove Mining Inc → Turtle Dove Mines; 1987-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Pendley Stanley → Turtle Dove Mines; 1987-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Pendley Stanley → Poplar Grove Mining Inc; 1987-10-01 to current/open; source msha-controller-operator-history