# Relationship history for MSHA mine 3304583

Current hierarchy: **Michael  Hollingshead → SRM Materials, LLC → Germantown S&G**

- 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:** Ronal L  Weidle Sr → Germantown S&G; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Weidle Corp. → Germantown S&G; 2007-04-10 to 2023-04-16; source msha-controller-operator-history
- **controller_controls_operator:** Ronal L  Weidle Sr → Weidle Corp.; 2007-04-10 to 2023-04-16; source msha-controller-operator-history
- **controller_controls_mine:** Michael  Hollingshead et al → Germantown S&G; 2013-12-26 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** SRM Materials, LLC → Germantown S&G; 2023-04-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Michael  Hollingshead et al → SRM Materials, LLC; 2023-04-17 to current/open; source msha-controller-operator-history