# Relationship history for MSHA mine 2003646

Current hierarchy: **Barbara  Frieden → Stone Mountain Aggregates, LLC. → Stone Mountain**

- 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:** Stone Mountain Aggregates, LLC. → Stone Mountain; 2023-05-04 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Barbara  Frieden → Stone Mountain; 2023-05-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Barbara  Frieden → Stone Mountain Aggregates, LLC.; 2023-05-04 to current/open; source msha-controller-operator-history