# Relationship history for MSHA mine 2501324

Current hierarchy: **Tony  Emme; Becky  Emme → Emme Sand & Gravel, Inc. → Frickel Location**

- 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

- **controller_controls_mine:** Becky  Emme → Frickel Location; 2024-03-19 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Emme Sand & Gravel, Inc. → Frickel Location; 2024-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Becky  Emme → Emme Sand & Gravel, Inc.; 2024-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Tony  Emme → Emme Sand & Gravel, Inc.; 2024-05-01 to current/open; source msha-controller-operator-history