# Relationship history for MSHA mine 3401948

Current hierarchy: **David E  Baker → Oklahoma Sandstone LLC → Oklahoma Sandstone LLC**

- 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:** Sanchez Stone → Oklahoma Sandstone LLC; 2004-09-28 to 2005-04-30; source msha-controller-operator-history
- **controller_controls_mine:** Ishmael  Sanchez → Oklahoma Sandstone LLC; 2004-09-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ishmael  Sanchez → Sanchez Stone; 2004-09-28 to 2005-04-30; source msha-controller-operator-history
- **operator_operates_mine:** Oklahoma Sandstone LLC → Oklahoma Sandstone LLC; 2005-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Ismael  Sanchez et al → Oklahoma Sandstone LLC; 2005-05-01 to 2007-02-20; source msha-controller-operator-history
- **controller_controls_operator:** Ismael  Sanchez et al → Oklahoma Sandstone LLC; 2005-05-01 to 2007-02-20; source msha-controller-operator-history
- **controller_controls_operator:** Sailfish Enterprises et al → Oklahoma Sandstone LLC; 2005-05-01 to 2007-02-20; source msha-controller-operator-history
- **controller_controls_mine:** Patricia  Melton → Oklahoma Sandstone LLC; 2007-02-21 to 2009-11-15; source msha-controller-operator-history
- **controller_controls_operator:** Patricia  Melton → Oklahoma Sandstone LLC; 2007-02-21 to 2009-11-15; source msha-controller-operator-history
- **controller_controls_mine:** David E  Baker → Oklahoma Sandstone LLC; 2009-11-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** David E  Baker → Oklahoma Sandstone LLC; 2009-11-16 to current/open; source msha-controller-operator-history