# Relationship history for MSHA mine 0202988

Current hierarchy: **Michael T  Henrickson; Dawn L  Henrickson → Henrickson Enterprises LLC → Dewey Pit**

- 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:** Henrickson Enterprises LLC → Dewey Pit; 2002-06-27 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Michael T  Henrickson et al → Dewey Pit; 2002-06-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Michael T  Henrickson et al → Henrickson Enterprises LLC; 2002-06-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dawn L  Henrickson et al → Henrickson Enterprises LLC; 2002-06-27 to current/open; source msha-controller-operator-history