# Relationship history for MSHA mine 2200595

Current hierarchy: **Mc Ree F H → Mc Ree Sand & Gravel Inc → Mc Ree Sand And Gravel**

- 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:** Parker Sand & Gravel → Mc Ree Sand And Gravel; 1987-05-01 to 1988-11-06; source msha-controller-operator-history
- **controller_controls_mine:** Charles A  Parker → Mc Ree Sand And Gravel; 1987-05-01 to 1988-11-06; source msha-controller-operator-history
- **controller_controls_operator:** Charles A  Parker → Parker Sand & Gravel; 1987-05-01 to 1988-11-06; source msha-controller-operator-history
- **operator_operates_mine:** Mc Ree Sand & Gravel Inc → Mc Ree Sand And Gravel; 1988-11-07 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Mc Ree F H → Mc Ree Sand And Gravel; 1988-11-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mc Ree F H → Mc Ree Sand & Gravel Inc; 1988-11-07 to current/open; source msha-controller-operator-history