# Relationship history for MSHA mine 2000780

Current hierarchy: **Robert L Chandonnet → Nugent Sand Company Inc → Nugent Sand Plant #2**

- 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:** Nugent Sand Company Inc → Nugent Sand Plant #2; 1950-01-01 to 1989-05-10; source msha-controller-operator-history
- **controller_controls_mine:** William J Cannon Trust → Nugent Sand Plant #2; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** William J Cannon Trust → Nugent Sand Company Inc; 1950-01-01 to 1989-05-10; source msha-controller-operator-history
- **operator_operates_mine:** Nugent Sand Company Inc → Nugent Sand Plant #2; 1989-05-11 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Robert L Chandonnet → Nugent Sand Plant #2; 1989-05-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert L Chandonnet → Nugent Sand Company Inc; 1989-05-11 to current/open; source msha-controller-operator-history