# Relationship history for MSHA mine 4105045

Current hierarchy: **Gregory Scott  Smith; Jeffery D  Kuenzle → Rock Solid Materials → Rock Solid Materials**

- 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:** Rock Solid Materials → Rock Solid Materials; 2013-12-09 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Gregory Scott  Smith et al → Rock Solid Materials; 2013-12-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gregory Scott  Smith et al → Rock Solid Materials; 2013-12-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jeffery D  Kuenzle et al → Rock Solid Materials; 2013-12-09 to current/open; source msha-controller-operator-history