# Relationship history for MSHA mine 2800886

Current hierarchy: **John C  Parker → Atlantic Gravel Inc → Atlantic Gravel 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:** Gravatt Sand & Gravel → Atlantic Gravel Inc; 1950-01-01 to 1981-08-11; source msha-controller-operator-history
- **controller_controls_mine:** Gravatt James E → Atlantic Gravel Inc; 1950-01-01 to 1981-08-11; source msha-controller-operator-history
- **controller_controls_operator:** Gravatt James E → Gravatt Sand & Gravel; 1950-01-01 to 1981-08-11; source msha-controller-operator-history
- **operator_operates_mine:** Atlantic Gravel Inc → Atlantic Gravel Inc; 1981-08-12 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** John C  Parker → Atlantic Gravel Inc; 1981-08-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John C  Parker → Atlantic Gravel Inc; 1981-08-12 to current/open; source msha-controller-operator-history