# Relationship history for MSHA mine 4001312

Current hierarchy: **Management Investors & Norman Reid → Lewis Coal Company → No 1 Strip 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:** C R Lewis Coal Company → No 1 Strip Mine; 1950-01-01 to 1974-12-01; source msha-controller-operator-history
- **controller_controls_mine:** Lewis C R Coal Company → No 1 Strip Mine; 1950-01-01 to 1974-12-01; source msha-controller-operator-history
- **controller_controls_operator:** Lewis C R Coal Company → C R Lewis Coal Company; 1950-01-01 to 1974-12-01; source msha-controller-operator-history
- **operator_operates_mine:** Lewis Coal Company → No 1 Strip Mine; 1974-12-02 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Management Investors & Norman Reid → No 1 Strip Mine; 1974-12-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Management Investors & Norman Reid → Lewis Coal Company; 1974-12-02 to current/open; source msha-controller-operator-history