# Relationship history for MSHA mine 0403874

Current hierarchy: **Susan  Bihlman → Bihlman Butte Rock → Meyer Pit**

- 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:** Bihlman Butte Rock → Meyer Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Greg T  Bihlman → Meyer Pit; 1950-01-01 to 2012-12-11; source msha-controller-operator-history
- **controller_controls_operator:** Greg T  Bihlman → Bihlman Butte Rock; 1950-01-01 to 2012-12-11; source msha-controller-operator-history
- **controller_controls_mine:** Susan  Bihlman → Meyer Pit; 2012-12-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Susan  Bihlman → Bihlman Butte Rock; 2012-12-12 to current/open; source msha-controller-operator-history