# Relationship history for MSHA mine 2902392

Current hierarchy: **Dave R  Pettingill → Pettingill Enterprises → Inertia 4048 Impact Crusher Big Daddy**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **controller_controls_mine:** Dave R  Pettingill → Inertia 4048 Impact Crusher Big Daddy; 2003-08-08 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Pettingill Enterprises → Inertia 4048 Impact Crusher Big Daddy; 2009-09-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dave R  Pettingill → Pettingill Enterprises; 2009-09-15 to current/open; source msha-controller-operator-history