# Relationship history for MSHA mine 1001586

Current hierarchy: **Walker Jack & Conway Ivy → American Independence Mines & Minerals Company → Fourth Of July 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:** American Independence Mines & Minerals Company → Fourth Of July Mine; 1982-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Walker Jack & Conway Ivy → Fourth Of July Mine; 1982-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Walker Jack & Conway Ivy → American Independence Mines & Minerals Company; 1982-08-01 to current/open; source msha-controller-operator-history