# Relationship history for MSHA mine 3401362

Current hierarchy: **Hudson A Z → H H H Mining Company Inc → Martin No 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** H H H Mining Company Inc → Martin No 1; 1982-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Hudson A Z Et Al → Martin No 1; 1982-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hudson A Z Et Al → H H H Mining Company Inc; 1982-07-01 to current/open; source msha-controller-operator-history