# Relationship history for MSHA mine 3003623

Current hierarchy: **Peckham Industries Inc → Peckham Materials Corp → Peckham Mats Corp #49 Ashland 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Peckham Industries Inc → Peckham Mats Corp #49 Ashland Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Peckham Materials Corp → Peckham Mats Corp #49 Ashland Quarry; 2008-03-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Peckham Industries Inc → Peckham Materials Corp; 2008-03-17 to current/open; source msha-controller-operator-history