# Relationship history for MSHA mine 2002632

Current hierarchy: **Williams Colin D → Williams Brothers Asphalt Paving Company Inc → Ingham County 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

- **controller_controls_mine:** Williams Colin D → Ingham County Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Williams Brothers Asphalt Paving Company Inc → Ingham County Pit; 1981-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Williams Colin D → Williams Brothers Asphalt Paving Company Inc; 1981-04-01 to current/open; source msha-controller-operator-history