# Relationship history for MSHA mine 4801919

Current hierarchy: **Ronald  Sandquist → FireSteel Well Service Inc. → Pickrel #2**

- 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:** FireSteel Well Service Inc. → Pickrel #2; 2026-06-18 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Ronald  Sandquist → Pickrel #2; 2026-06-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ronald  Sandquist → FireSteel Well Service Inc.; 2026-06-18 to current/open; source msha-controller-operator-history