# Relationship history for MSHA mine 4502777

Current hierarchy: **Delores A  Afdem → Collins Road Sand & Gravel Inc → Collins Pit**

- 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:** Collins Road Gravel → Collins Pit; 1980-03-01 to 1987-11-23; source msha-controller-operator-history
- **controller_controls_mine:** Donald W  Afdem → Collins Pit; 1980-03-01 to 1987-11-23; source msha-controller-operator-history
- **controller_controls_operator:** Donald W  Afdem → Collins Road Gravel; 1980-03-01 to 1987-11-23; source msha-controller-operator-history
- **operator_operates_mine:** Collins Road Sand & Gravel Inc → Collins Pit; 1987-11-24 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Delores A  Afdem → Collins Pit; 1987-11-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Delores A  Afdem → Collins Road Sand & Gravel Inc; 1987-11-24 to current/open; source msha-controller-operator-history