# Relationship history for MSHA mine 4503015

Current hierarchy: **Richard H  Delano → Delano Wind River Mine → DELANO WIND RIVER 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Youngquist Mine Development & Consultation Inc → DELANO WIND RIVER MINE; 1984-08-01 to 1994-02-22; source msha-controller-operator-history
- **controller_controls_mine:** Ted  Youngquist → DELANO WIND RIVER MINE; 1984-08-01 to 1994-02-22; source msha-controller-operator-history
- **controller_controls_operator:** Ted  Youngquist → Youngquist Mine Development & Consultation Inc; 1984-08-01 to 1994-02-22; source msha-controller-operator-history
- **operator_operates_mine:** Delano Wind River Mine → DELANO WIND RIVER MINE; 1994-02-23 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Richard H  Delano → DELANO WIND RIVER MINE; 1994-02-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Richard H  Delano → Delano Wind River Mine; 1994-02-23 to current/open; source msha-controller-operator-history