# Relationship history for MSHA mine 1519285

Current hierarchy: **Lynn  Walls → Shale Pit → Shale Pit**

- 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:** Shale Pit → Shale Pit; 2008-08-13 to 2017-06-07; source msha-controller-operator-history
- **controller_controls_mine:** Ernest R  Walls → Shale Pit; 2008-08-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ernest R  Walls → Shale Pit; 2008-08-13 to 2017-06-07; source msha-controller-operator-history
- **operator_operates_mine:** Shale Pit → Shale Pit; 2017-06-08 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Lynn  Walls → Shale Pit; 2017-06-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lynn  Walls → Shale Pit; 2017-06-08 to current/open; source msha-controller-operator-history