# Relationship history for MSHA mine 4104657

Current hierarchy: **Sherman County-TX → Moore County Road &  Bridge → Moore County 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Moore County Road &  Bridge → Moore County Portable 1; 2007-03-19 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Sherman County-TX → Moore County Portable 1; 2007-03-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Sherman County-TX → Moore County Road &  Bridge; 2007-03-19 to current/open; source msha-controller-operator-history