# Relationship history for MSHA mine 3609327

Current hierarchy: **Krista M  Roehrig → Frederick Consulting → Forestville Silt Dam**

- 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:** Frederick Consulting → Forestville Silt Dam; 2005-05-03 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Krista M  Roehrig → Forestville Silt Dam; 2005-05-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Krista M  Roehrig → Frederick Consulting; 2005-05-03 to current/open; source msha-controller-operator-history