# Relationship history for MSHA mine 0101534

Current hierarchy: **Thursby James N Sr → East Walker Coal Corp → Walker Co No 1 Or Walker Co Pit 1**

- 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:** East Walker Coal Corp → Walker Co No 1 Or Walker Co Pit 1; 1976-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Thursby James N Sr → Walker Co No 1 Or Walker Co Pit 1; 1976-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Thursby James N Sr → East Walker Coal Corp; 1976-07-01 to current/open; source msha-controller-operator-history