# Relationship history for MSHA mine 0103151

Current hierarchy: **David  Dykes → Solid Rock & Materials → DYKES -1**

- 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:** Solid Rock & Materials → DYKES -1; 1999-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** David  Dykes → DYKES -1; 1999-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** David  Dykes → Solid Rock & Materials; 1999-05-01 to current/open; source msha-controller-operator-history