# Relationship history for MSHA mine 4605929

Current hierarchy: **Brooks William H → Kst Mining Company Inc → K S T Mine No 2 Surface**

- 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

- **controller_controls_mine:** Brooks William H → K S T Mine No 2 Surface; 1978-05-15 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Kst Mining Company Inc → K S T Mine No 2 Surface; 1978-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Brooks William H → Kst Mining Company Inc; 1978-12-01 to current/open; source msha-controller-operator-history