# Relationship history for MSHA mine 0405285

Current hierarchy: **Alexander Redwood Partners, LLC → Humboldt Redwood Company, LLC → BALD HILLS QUARRY**

- 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

- **controller_controls_mine:** Karen J  Hay  et al → BALD HILLS QUARRY; 1989-10-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Bed Rock Inc → BALD HILLS QUARRY; 1996-06-01 to 2019-08-22; source msha-controller-operator-history
- **controller_controls_operator:** Karen J  Hay  et al → Bed Rock Inc; 1996-06-01 to 2019-08-22; source msha-controller-operator-history
- **controller_controls_operator:** William G  Hay  et al → Bed Rock Inc; 1996-06-01 to 2019-08-22; source msha-controller-operator-history
- **controller_controls_mine:** Alexander Redwood Partners, LLC et al → BALD HILLS QUARRY; 2008-08-18 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Humboldt Redwood Company, LLC → BALD HILLS QUARRY; 2019-08-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Alexander Redwood Partners, LLC et al → Humboldt Redwood Company, LLC; 2019-08-23 to current/open; source msha-controller-operator-history