# Relationship history for MSHA mine 1506853

Current hierarchy: **Coleman Mary Lou → Seign Camp Coal Company → No 1 Mine**

- 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:** Meadows & Allen Coal Company → No 1 Mine; 1973-10-01 to 1974-03-21; source msha-controller-operator-history
- **controller_controls_mine:** Allen Lewis → No 1 Mine; 1973-10-01 to 1974-03-21; source msha-controller-operator-history
- **controller_controls_operator:** Allen Lewis → Meadows & Allen Coal Company; 1973-10-01 to 1974-03-21; source msha-controller-operator-history
- **operator_operates_mine:** Seign Camp Coal Company → No 1 Mine; 1974-03-22 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Coleman Mary Lou → No 1 Mine; 1974-03-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Coleman Mary Lou → Seign Camp Coal Company; 1974-03-22 to current/open; source msha-controller-operator-history