# Relationship history for MSHA mine 4202531

Current hierarchy: **Tyson E  Rackley; Joe E  Rackley → RBC Leasing, LLC → Hat Rock Pit #1**

- 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:** Rock Biter Crushing LLC → Hat Rock Pit #1; 2009-07-14 to 2011-01-23; source msha-controller-operator-history
- **controller_controls_mine:** Joe E  Rackley et al → Hat Rock Pit #1; 2009-07-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Joe E  Rackley et al → Rock Biter Crushing LLC; 2009-07-14 to 2011-01-23; source msha-controller-operator-history
- **controller_controls_operator:** Tyson E  Rackley et al → Rock Biter Crushing LLC; 2009-07-14 to 2011-01-23; source msha-controller-operator-history
- **operator_operates_mine:** RBC Leasing, LLC → Hat Rock Pit #1; 2011-01-24 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Joe E  Rackley et al → Hat Rock Pit #1; 2011-01-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Joe E  Rackley et al → RBC Leasing, LLC; 2011-01-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Tyson E  Rackley et al → RBC Leasing, LLC; 2011-01-24 to current/open; source msha-controller-operator-history