# Relationship history for MSHA mine 4103622

Current hierarchy: **Whittenburg Marvin → Woodard Construction Inc → PORT #1**

- 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:** Woodard Construction Inc → PORT #1; 1990-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Whittenburg Marvin → PORT #1; 1990-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Whittenburg Marvin → Woodard Construction Inc; 1990-06-01 to current/open; source msha-controller-operator-history