# Relationship history for MSHA mine 0901213

Current hierarchy: **Michael  Hollingshead → SRM Materials, LLC → Elberton Quarry**

- 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:** North Georgia Aggregates → Elberton Quarry; 2011-02-16 to 2024-10-23; source msha-controller-operator-history
- **controller_controls_mine:** David  Reese → Elberton Quarry; 2011-02-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** David  Reese → North Georgia Aggregates; 2011-02-16 to 2024-10-23; source msha-controller-operator-history
- **controller_controls_mine:** Michael  Hollingshead et al → Elberton Quarry; 2013-12-26 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** SRM Materials, LLC → Elberton Quarry; 2024-10-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Michael  Hollingshead et al → SRM Materials, LLC; 2024-10-24 to current/open; source msha-controller-operator-history