# Relationship history for MSHA mine 0800070

Current hierarchy: **Amcar Inc → Southern Materials Corp → Lowell Mine & Plant**

- 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:** Southern Materials Corp → Lowell Mine & Plant; 1950-01-01 to 1983-05-31; source msha-controller-operator-history
- **controller_controls_mine:** Roberts Fred N & H B Jr → Lowell Mine & Plant; 1950-01-01 to 1983-05-31; source msha-controller-operator-history
- **controller_controls_operator:** Roberts Fred N & H B Jr → Southern Materials Corp; 1950-01-01 to 1983-05-31; source msha-controller-operator-history
- **operator_operates_mine:** Southern Materials Corp → Lowell Mine & Plant; 1983-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Amcar Inc → Lowell Mine & Plant; 1983-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Amcar Inc → Southern Materials Corp; 1983-06-01 to current/open; source msha-controller-operator-history