# Relationship history for MSHA mine 4202515

Current hierarchy: **Samuel W  Jessop → Summit Crushing LLC → Montezuma Creek Mine**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Summit Crushing LLC → Montezuma Creek Mine; 2008-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Samuel W  Jessop → Montezuma Creek Mine; 2008-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Samuel W  Jessop → Summit Crushing LLC; 2008-09-01 to current/open; source msha-controller-operator-history