# Relationship history for MSHA mine 4001815

Current hierarchy: **Deep Mine Coal Company → Deep Mine Coal Company → Deep Mine No 2**

- 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

- **operator_operates_mine:** Deep Mine Coal Company → Deep Mine No 2; 1975-01-01 to 1975-08-31; source msha-controller-operator-history
- **controller_controls_mine:** Wilson Lonas & Wayne Morgan → Deep Mine No 2; 1975-01-01 to 1975-08-31; source msha-controller-operator-history
- **controller_controls_operator:** Wilson Lonas & Wayne Morgan → Deep Mine Coal Company; 1975-01-01 to 1975-08-31; source msha-controller-operator-history
- **operator_operates_mine:** Deep Mine Coal Company → Deep Mine No 2; 1975-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Deep Mine Coal Company → Deep Mine No 2; 1975-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Deep Mine Coal Company → Deep Mine Coal Company; 1975-09-01 to current/open; source msha-controller-operator-history