# Relationship history for MSHA mine 0405446

Current hierarchy: **Michael  Palmer; Lemoin  Brewer → Snow'S Quarry Products → SNOW'S 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

- **operator_operates_mine:** Snow'S Quarry Products → SNOW'S QUARRY; 2000-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Michael  Palmer et al → SNOW'S QUARRY; 2000-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Michael  Palmer et al → Snow'S Quarry Products; 2000-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lemoin  Brewer et al → Snow'S Quarry Products; 2000-01-01 to current/open; source msha-controller-operator-history