# Relationship history for MSHA mine 4001765

Current hierarchy: **Management Investors & Norman Reid → Lewis Coal Company → No 1 Surface**

- 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

- **controller_controls_mine:** Management Investors & Norman Reid → No 1 Surface; 1974-12-02 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Lewis Coal Company → No 1 Surface; 1975-04-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Management Investors & Norman Reid → Lewis Coal Company; 1975-04-03 to current/open; source msha-controller-operator-history