# Relationship history for MSHA mine 3501021

Current hierarchy: **Smith Alicia → George W Smith → Smith'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:** Coos Bay Timber Operators Inc → Smith'S Quarry; 1950-01-01 to 1988-03-29; source msha-controller-operator-history
- **controller_controls_mine:** Donna L  Gould et al → Smith'S Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Donna L  Gould et al → Coos Bay Timber Operators Inc; 1950-01-01 to 1988-03-29; source msha-controller-operator-history
- **controller_controls_operator:** David G  Gould et al → Coos Bay Timber Operators Inc; 1950-01-01 to 1988-03-29; source msha-controller-operator-history
- **operator_operates_mine:** George W Smith → Smith'S Quarry; 1988-03-30 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Smith Alicia → Smith'S Quarry; 1988-03-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Smith Alicia → George W Smith; 1988-03-30 to current/open; source msha-controller-operator-history