# Relationship history for MSHA mine 3304203

Current hierarchy: **De Witt Richard H → Mc Arthur Lumber & Post Company Inc → Mcarthur Lumber & Post Co Inc**

- 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:** Mc Arthur Lumber & Post Company Inc → Mcarthur Lumber & Post Co Inc; 1990-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** De Witt Richard H → Mcarthur Lumber & Post Co Inc; 1990-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** De Witt Richard H → Mc Arthur Lumber & Post Company Inc; 1990-06-01 to current/open; source msha-controller-operator-history