# Relationship history for MSHA mine 0901186

Current hierarchy: **Robert W  Pereira → Corridor Mining LLC → Culverton Quarry**

- 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:** Corridor Mining LLC → Culverton Quarry; 2008-03-25 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Robert W  Pereira → Culverton Quarry; 2008-03-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert W  Pereira → Corridor Mining LLC; 2008-03-25 to current/open; source msha-controller-operator-history