# Relationship history for MSHA mine 4801459

Current hierarchy: **Laramie County-Wyoming → Laramie County Public Works → Laramie County (portable)**

- 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:** Laramie County Public Works → Laramie County (portable); 1986-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Laramie County-Wyoming → Laramie County (portable); 1986-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Laramie County-Wyoming → Laramie County Public Works; 1986-09-01 to current/open; source msha-controller-operator-history