# Relationship history for MSHA mine 0404558

Current hierarchy: **Como Don C → International Recovery Inc → Reward-Brown Monster**

- 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

- **controller_controls_mine:** Ted  Youngquist → Reward-Brown Monster; 1981-05-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Youngquist Mining Company → Reward-Brown Monster; 1981-11-01 to 1983-08-14; source msha-controller-operator-history
- **controller_controls_operator:** Ted  Youngquist → Youngquist Mining Company; 1981-11-01 to 1983-08-14; source msha-controller-operator-history
- **operator_operates_mine:** International Recovery Inc → Reward-Brown Monster; 1983-08-15 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Como Don C → Reward-Brown Monster; 1983-08-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Como Don C → International Recovery Inc; 1983-08-15 to current/open; source msha-controller-operator-history