# Relationship history for MSHA mine 0901065

Current hierarchy: **Smith C Douglas → Palmetto Blue Quarry Inc → PALMETTO BLUE QUARRY, INC.**

- 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

- **operator_operates_mine:** Palmetto Blue Quarry Inc → PALMETTO BLUE QUARRY, INC.; 1992-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Smith C Douglas → PALMETTO BLUE QUARRY, INC.; 1992-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Smith C Douglas → Palmetto Blue Quarry Inc; 1992-01-01 to current/open; source msha-controller-operator-history