# Relationship history for MSHA mine 4801648

Current hierarchy: **Big Horn County-Wy → Big Horn County Road & Bridge → Crusher No 2**

- 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

- **controller_controls_mine:** Big Horn County-Wy → Crusher No 2; 1988-04-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Big Horn County Road & Bridge → Crusher No 2; 2004-02-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Big Horn County-Wy → Big Horn County Road & Bridge; 2004-02-17 to current/open; source msha-controller-operator-history