# Relationship history for MSHA mine 2200858

Current hierarchy: **Adam  McDonald → SOLID ROCK SAND AND GRAVEL → DIDLAKE 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:** McDonald Sand and Gravel → DIDLAKE PIT; 2025-02-13 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Adam  McDonald → DIDLAKE PIT; 2025-02-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Adam  McDonald → McDonald Sand and Gravel; 2025-02-13 to current/open; source msha-controller-operator-history