# Relationship history for MSHA mine 3201008

Current hierarchy: **William  Fisher → Iron Horse Industrial Services Inc → Iron Horse Portable 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:** Iron Horse Industrial Services Inc → Iron Horse Portable 1; 2013-04-30 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** William  Fisher → Iron Horse Portable 1; 2013-04-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** William  Fisher → Iron Horse Industrial Services Inc; 2013-04-30 to current/open; source msha-controller-operator-history