# Relationship history for MSHA mine 3608218

Current hierarchy: **Kerstetter Russ & Roland Klinger → Brookside Coal Company → Four Foot Slope**

- 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:** Brookside Coal Company → Four Foot Slope; 1991-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Kerstetter Russ & Roland Klinger Et Al → Four Foot Slope; 1991-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kerstetter Russ & Roland Klinger Et Al → Brookside Coal Company; 1991-01-01 to current/open; source msha-controller-operator-history