# Relationship history for MSHA mine 1506212

Current hierarchy: **James  Ward → Lewis Coal Company Inc → No 11 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **controller_controls_mine:** James  Ward → No 11 Strip Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Lewis Coal Company Inc → No 11 Strip Mine; 1972-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James  Ward → Lewis Coal Company Inc; 1972-11-01 to current/open; source msha-controller-operator-history