# Relationship history for MSHA mine 2200851

Current hierarchy: **Adam  McDonald → McDonald Sand and Gravel LLC → McDonald 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** McDonald Sand and Gravel LLC → McDonald Pit; 2024-01-16 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Adam  McDonald → McDonald Pit; 2024-01-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Adam  McDonald → McDonald Sand and Gravel LLC; 2024-01-16 to current/open; source msha-controller-operator-history