# Relationship history for MSHA mine 1001252

Current hierarchy: **Casey  Parker → Parker's Sand & Gravel Inc → Parker's Sand & 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: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **operator_operates_mine:** Parker's Sand & Gravel Inc → Parker's Sand & Gravel Inc; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Mike  Parker → Parker's Sand & Gravel Inc; 1950-01-01 to 2023-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Mike  Parker → Parker's Sand & Gravel Inc; 1950-01-01 to 2023-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Casey  Parker → Parker's Sand & Gravel Inc; 2024-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Casey  Parker → Parker's Sand & Gravel Inc; 2024-01-01 to current/open; source msha-controller-operator-history