# Relationship history for MSHA mine 1103192

Current hierarchy: **Michael F  Ducey → SRM Materials → SRM 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:** Shady Rest Materials, LLC → SRM Materials; 2008-04-08 to 2012-01-02; source msha-controller-operator-history
- **controller_controls_mine:** Steve  Gilbert → SRM Materials; 2008-04-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Steve  Gilbert → Shady Rest Materials, LLC; 2008-04-08 to 2012-01-02; source msha-controller-operator-history
- **operator_operates_mine:** SRM Materials → SRM Materials; 2012-01-03 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Michael F  Ducey → SRM Materials; 2012-01-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Michael F  Ducey → SRM Materials; 2012-01-03 to current/open; source msha-controller-operator-history