# Relationship history for MSHA mine 0404853

Current hierarchy: **Smith Mike → National Resource Management Inc → Camp Rock 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:** National Resource Management Inc → Camp Rock Mine; 1986-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Smith Mike → Camp Rock Mine; 1986-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Smith Mike → National Resource Management Inc; 1986-12-01 to current/open; source msha-controller-operator-history